rtpproxy Module


Table of Contents

1. Admin Guide
1.1. Overview
1.2. Multiple RTPProxy usage
1.3. RTPProxy timeout notifications
1.4. Dependencies
1.4.1. OpenSIPS Modules
1.4.2. External Libraries or Applications
1.5. Exported Parameters
1.5.1. rtpproxy_sock (string)
1.5.2. rtpproxy_disable_tout (integer)
1.5.3. rtpproxy_timeout (string)
1.5.4. rtpproxy_autobridge (integer)
1.5.5. rtpproxy_retr (integer)
1.5.6. default_set (integer)
1.5.7. nortpproxy_str (string)
1.5.8. db_url (string)
1.5.9. db_table (string)
1.5.10. rtpp_socket_col (string)
1.5.11. set_id_col (string)
1.5.12. rtpp_notify_socket (string)
1.5.13. generated_sdp_port_min (integer)
1.5.14. generated_sdp_port_max (integer)
1.5.15. generated_sdp_media_ip (string)
1.6. Exported Functions
1.6.1. rtpproxy_engage([[flags][, [ip_address][, [set_id][, [sock_var][, ret_var]]]]])
1.6.2. rtpproxy_offer([[flags][, [ip_address][, [set_id][, [sock_var][, [ret_var][, [body_var]]]]]])
1.6.3. rtpproxy_answer([[flags][, [ip_address][, [set_id][, [sock_var][, [ret_var][, [body_var]]]]]]])
1.6.4. rtpproxy_unforce([[set_id][, sock_var]])
1.6.5. rtpproxy_stream2uac(prompt_name, count[, [set_id][, sock_var]]), rtpproxy_stream2uas(prompt_name, count[, [set_id][, sock_var]])
1.6.6. rtpproxy_stop_stream2uac([[set_id][, sock_var]]), rtpproxy_stop_stream2uas([[set_id][, sock_var]])
1.6.7. rtpproxy_start_recording([[set_id][, [sock_var][, [flags][, [destination][, mediastream]]]]])
1.6.8. rtpproxy_stats(up_pvar, down_var, sent_var, fail_var[, [set_id][, sock_var]])
1.6.9. rtpproxy_all_stats(stats_avp[, [set_id][, sock_var]])
1.7. Exported MI Functions
1.7.1. rtpproxy_enable
1.7.2. rtpproxy_show
1.7.3. rtpproxy_reload
1.8. Exported Events
1.8.1. E_RTPPROXY_STATUS
1.8.2. E_RTPPROXY_DTMF
2. Frequently Asked Questions
3. Contributors
3.1. By Commit Statistics
3.2. By Commit Activity
4. Documentation
4.1. Contributors

List of Tables

3.1. Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)
3.2. Most recently active contributors(1) to this module

List of Examples

1.1. Set rtpproxy_sock parameter
1.2. Set rtpproxy_disable_tout parameter
1.3. Set rtpproxy_timeout parameter to 200ms
1.4. Enable auto-bridging feature
1.5. Set rtpproxy_retr parameter
1.6. Set default_set parameter
1.7. Set nortpproxy_str parameter
1.8. Set db_url parameter
1.9. Set db_table parameter
1.10. Set rtpp_socket_col parameter
1.11. Set set_id parameter
1.12. Set rtpp_notify_socket parameter
1.13. Set generated_sdp_port_min parameter
1.14. Set generated_sdp_port_max parameter
1.15. Set generated_sdp_media_ip parameter
1.16. rtpproxy_engage usage
1.17. rtpproxy_offer usage
1.18. rtpproxy_answer usage
1.19. rtpproxy_unforce usage
1.20. rtpproxy_stream2xxx usage
1.21. rtpproxy_start_recording usage
1.22. rtpproxy_stats usage
1.23. rtpproxy_all_stats usage
1.24. rtpproxy_enable usage
1.25. rtpproxy_show usage
1.26. rtpproxy_reload usage

Chapter 1. Admin Guide

1.1. Overview

This module is used by OpenSIPS to communicate with RTPProxy, a media relay proxy used to make the communication between user agents behind NAT possible.

This module is also used along with RTPProxy to record media streams between user agents or to play media to either UAc or UAs.

1.2. Multiple RTPProxy usage

Currently, the rtpproxy module can support multiple rtpproxies for balancing/distribution and control/selection purposes.

The module allows the definition of several sets of rtpproxies - load-balancing will be performed over a set and the user has the ability to choose what set should be used. The set is selected via its id - the id being defined along with the set. Refer to the rtpproxy_sock module parameter definition for syntax description.

The balancing inside a set is done automatically by the module based on the weight of each rtpproxy from the set. Note that if rtpproxy has weight 0, it will be used only when no other rtpproxies (with a different weight value than 0) respond. Default weight is 1.

Starting with OpenSIPS 2.1, engage_rtp_proxy(), unforce_rtp_proxy() and start_recording() functions have been fully replaced by rtpproxy_engage(), rtpproxy_unforce() and rtpproxy_start_recording().

IMPORTANT: if you use multiple sets, make sure you use the same set for both rtpproxy_offer()/rtpproxy_answer() and rtpproxy_unforce()!!

1.3. RTPProxy timeout notifications

Nathelper module can also receive timeout notifications from multiple rtpproxies. RTPProxy can be configured to send notifications when a session doesn't receive any media for a configurable interval of time. The rtpproxy modules has implemented a listener for such notifications and when received it terminates the dialog at SIP level (send BYE to both ends), with the help of dialog module.

In our tests with RTPProxy we observed some limitations and also provide a patch for it against git commit 600c80493793bafd2d69427bc22fcb43faad98c5. It contains an addition and implements separate timeout parameters for the phases of session establishment and ongoing sessions. In the official code a single timeout parameter controls both session establishment and rtp timeout and the timeout notification is also sent in the call establishment phase. This is a problem since we want to detect rtp timeout fast, but also allow a longer period for call establishment.

Note that RTPProxy version v2.0.0 has integrated this feature upstream, therefore this patch is no longer needed.

To enable timeout notification there are several steps that you must follow:

Start OpenSIPS timeout detection by setting the rtpp_notify_socket module parameter in your configuration script. This is the socket where further notification will be received from rtpproxies. This socket must be a TCP or UNIX socket. Also, for all the calls that require notification, the rtpproxy_engage(), rtpproxy_offer() and rtpproxy_answer() functions must be called with the n flag.

Configure RTPProxy to use timeout notification by adding the following command line parameters:

  • -n timeout_socket - specifies where the notifications will be sent. This socket must be the same as rtpp_notify_socket OpenSIPS module parameter. This parameter is mandatory.

  • -T ttl - limits the rtp session timeout to ttl. This parameter is optional and the default value is 60 seconds.

  • -W ttl - limits the session establishment timeout to ttl. This parameter is optional and the default value is 60 seconds.

All of the previous parameters can be used with the offical RTPProxy release, except for the last one. It has been added, together with other modifications to RTPProxy in order to work properly. The patch is located in the patches directory in the module.

To get the patched version from git you must follow theese steps:

  • Get the latest source code: git clone git://sippy.git.sourceforge.net/gitroot/sippy/rtpproxy

  • Make a branch from the commit: git checkout -b branch_name 600c80493793bafd2d69427bc22fcb43faad98c5

  • Patch RTPProxy: patch < path_to_rtpproxy_patch

The patched version can also be found at: https://opensips.org/pub/rtpproxy/

1.4. Dependencies

1.4.1. OpenSIPS Modules

The following modules must be loaded before this module:

  • a database module - only if you want to load use a database table from where to load the rtp proxies sets.

  • dialog module - if using the rtpproxy_engage functions or RTPProxy timeout notifications.

1.4.2. External Libraries or Applications

The following libraries or applications must be installed before running OpenSIPS with this module loaded:

  • None.

1.5. Exported Parameters

1.5.1. rtpproxy_sock (string)

Definition of socket(s) used to connect to (a set) RTPProxy. It may specify a UNIX socket, an IPv4/IPv6 UDP socket or an IPv4/IPv6 TCP socket. If the protocol part (i.e. udp:) is missing, the socket is treated as a UNIX socket.

The definition also supports to specify a different IP that will be advertised instead of the one returned by RTPProxy. This is useful when having multiple RTPProxy servers that are located behind NAT, and listen only on private intefaces, but need to advertise a public one.

Default value is NONE (disabled).

Example 1.1. Set rtpproxy_sock parameter

...
# single rtpproxy with specific weight
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:22222=2")

# single rtpproxy with advertised address + weight
modparam("rtpproxy", "rtpproxy_sock", "udp:localhost:22222|8.8.8.8=2")

# multiple rtproxies for LB
modparam("rtpproxy", "rtpproxy_sock",
	"udp:localhost:22222 udp:localhost:22223 tcp:remote1:33422 tcp6:remote2:32322")

# multiple sets of multiple rtproxies
modparam("rtpproxy", "rtpproxy_sock", "1 == udp:localhost:22222 udp:localhost:22223")
modparam("rtpproxy", "rtpproxy_sock", "2 == udp:localhost:22223")
modparam("rtpproxy", "rtpproxy_sock", "2 == udp:localhost:22223|8.8.8.8")
...

1.5.2. rtpproxy_disable_tout (integer)

Once RTPProxy was found unreachable and marked as disable, rtpproxy will not attempt to establish communication to RTPProxy for rtpproxy_disable_tout seconds.

Default value is 60.

Example 1.2. Set rtpproxy_disable_tout parameter

...
modparam("rtpproxy", "rtpproxy_disable_tout", 20)
...

1.5.3. rtpproxy_timeout (string)

Timeout value in waiting for reply from RTPProxy.

Default value is 1.

Example 1.3. Set rtpproxy_timeout parameter to 200ms

...
modparam("rtpproxy", "rtpproxy_timeout", "0.2")
...

1.5.4. rtpproxy_autobridge (integer)

Enable auto-bridging feature. Does not properly function when doing serial/parallel forking!

Default value is 0.

Example 1.4. Enable auto-bridging feature

...
modparam("rtpproxy", "rtpproxy_autobridge", 1)
...

1.5.5. rtpproxy_retr (integer)

How many times rtpproxy should retry to send and receive after timeout was generated.

Default value is 5.

Example 1.5. Set rtpproxy_retr parameter

...
modparam("rtpproxy", "rtpproxy_retr", 2)
...

1.5.6. default_set (integer)

The parameter indicates the default RTPProxy set to be used when provisioning an engine in the config file without an explicit set, or when calling one of the rtpproxy_*() functions without an explicit set.

Default value is set 0.

Example 1.6. Set default_set parameter

...
modparam("rtpproxy", "default_set", 1)
...

1.5.7. nortpproxy_str (string)

The parameter sets the SDP attribute used by rtpproxy to mark the packet SDP informations have already been mangled.

If empty string, no marker will be added or checked.

Note

The string must be a complete SDP line, including the EOH (\r\n).

Default value is a=nortpproxy:yes\r\n.

Example 1.7. Set nortpproxy_str parameter

...
modparam("rtpproxy", "nortpproxy_str", "a=sdpmangled:yes\r\n")
...

1.5.8. db_url (string)

The database url. This parameter should be set if you want to use a database table from where to load or reload definitions of socket(s) used to connect to (a set) RTPProxy. The record from the database table will be read at start up (added to the ones defined with the rtpproxy_sock module parameter) and when the MI command rtpproxy_reload is issued(the definitions will be replaced with the ones from the database table).

Default value is NULL.

Example 1.8. Set db_url parameter

...
modparam("rtpproxy", "db_url", 
		"mysql://opensips:opensipsrw@192.168.2.132/opensips")
...


1.5.9. db_table (string)

The name of the database table containing definitions of socket(s) used to connect to (a set) RTPProxy.

Default value is rtpproxy_sockets.

Example 1.9. Set db_table parameter

...
modparam("rtpproxy", "db_table", "nh_sockets") 
...


1.5.10. rtpp_socket_col (string)

The name rtpp socket column in the database table.

Default value is rtpproxy_sock.

Example 1.10. Set rtpp_socket_col parameter

...
modparam("rtpproxy", "rtpp_socket_col", "rtpp_socket") 
...


1.5.11. set_id_col (string)

The name set id column in the database table.

Default value is set_id.

Example 1.11. Set set_id parameter

...
modparam("rtpproxy", "set_id_col", "rtpp_set_id") 
...


1.5.12. rtpp_notify_socket (string)

The socket OpenSIPS listens for notifications from RTPProxy. Currently OpenSIPS can receive RTP timeout and DTMF events.

Default value is NULL - no notifications are received.

Example 1.12. Set rtpp_notify_socket parameter

...
modparam("rtpproxy", "rtpp_notify_socket", "tcp:10.10.10.10:9999")

# use an UNIX socket
modparam("rtpproxy", "rtpp_notify_socket", "unix:/tmp/rtpproxy.unix")
# or
modparam("rtpproxy", "rtpp_notify_socket", "/tmp/rtpproxy.unix")
...


1.5.13. generated_sdp_port_min (integer)

When RTPProxy module needs to generate an SDP body, use this value as the minimum value of the port.

Default value is 35000.

Example 1.13. Set generated_sdp_port_min parameter

...
modparam("rtpproxy", "generated_sdp_port_min", 10000)
...
		

1.5.14. generated_sdp_port_max (integer)

When RTPProxy module needs to generate an SDP body, use this value as the maximum value of the port.

Default value is 65000.

Example 1.14. Set generated_sdp_port_max parameter

...
modparam("rtpproxy", "generated_sdp_port_max", 30000)
...
		

1.5.15. generated_sdp_media_ip (string)

When RTPProxy module needs to generate an SDP body, use this value as the media_ip in the c= and the o=.

Default value is 127.0.0.1.

Example 1.15. Set generated_sdp_media_ip parameter

...
modparam("rtpproxy", "generated_sdp_media_ip", "10.0.0.1")
...
		

1.6. Exported Functions

1.6.1.  rtpproxy_engage([[flags][, [ip_address][, [set_id][, [sock_var][, ret_var]]]]])

Rewrites SDP body to ensure that media is passed through an RTP proxy. It uses the dialog module facilities to keep track when the rtpproxy session must be updated. Function must only be called for the initial INVITE and internally takes care of rewriting the body of 200 OKs and ACKs. Note that when used in bridge mode, this function might advertise wrong interfaces in SDP (due to the fact that OpenSIPS is not aware of the RTPProxy configuration), so you might face an undefined behavior.

Meaning of the parameters is as follows:

  • flags(string, optional) - flags to turn on some features.

    • a - flags that UA from which message is received doesn't support symmetric RTP.

    • l - force lookup, that is, only rewrite SDP when corresponding session is already exists in the RTP proxy. By default is on when the session is to be completed (reply in non-swap or ACK in swap mode).

    • k - only create RTPProxy session, but do not modify the SDP body. This is useful when you only want to inject some media, but do not want to engage RTPProxy in the entire call.

    • i/e - when RTPProxy is used in bridge mode, these flags are used to indicate the direction of the media flow for the current request/reply. 'i' refers to the LAN (internal network) and corresponds to the first interface of RTPProxy (as specified by the -l parameter). 'e' refers to the WAN (external network) and corresponds to the second interface of RTPProxy. These flags should always be used together. For example, an INVITE (offer) that comes from the Internet (WAN) to goes to a local media server (LAN) should use the 'ei' flags. The answer should use the 'ie' flags. Depending on the scenario, the 'ii' and 'ee' combination are also supported. Only makes sense when RTPProxy is running in the bridge mode.

      NOTE: when using RTPProxy in bridge mode, all sessions are considered asymmetric (as oposed to symmetric if used in normal mode). If you have symmetric clients (this is the most common scenario), you'll have to force the s!

    • f - instructs rtpproxy to ignore marks inserted by another rtpproxy in transit to indicate that the session is already goes through another proxy. Allows creating chain of proxies.

    • r - flags that IP address in SDP should be trusted. Without this flag, rtpproxy ignores address in the SDP and uses source address of the SIP message as media address which is passed to the RTP proxy.

    • o - flags that IP from the origin description (o=) should be also changed.

    • c - flags to change the session-level SDP connection (c=) IP if media-description also includes connection information.

    • s/w - flags that for the UA from which message is received, support symmetric RTP must be forced.

    • n[<SOCKET>] - flags that enables the notification timeout for the session. One can specify an optional "advertised" socket between the < and > tags. If the socket is not specified, the value of rtpp_notify_socket is used.

    • d[NNN] - enables DTMF notifications for this call. One can optionally specify the payload type that DTMF will be used for this call - it it is not specified, RTPProxy uses the 101 pt. NOTE: this feature is currently only available in the RTPProxy rtpp_2_1_dtmf branch.

    • tNN - can be used to specify a RTP ttl for the caller. The NN represents the timeout in seconds for that stream. This can be useful in music on hold scenarios where only one client is sending RTP.

    • TNN - Similar to the tNN paramaeter, but used for tuning the calllee's ttl for RTP.

    • zNN - requests the RTPproxy to perform re-packetization of RTP traffic coming from the UA which has sent the current message to increase or decrease payload size per each RTP packet forwarded if possible. The NN is the target payload size in ms, for the most codecs its value should be in 10ms increments, however for some codecs the increment could differ (e.g. 30ms for GSM or 20ms for G.723). The RTPproxy would select the closest value supported by the codec. This feature could be used for significantly reducing bandwith overhead for low bitrate codecs, for example with G.729 going from 10ms to 100ms saves two thirds of the network bandwith.

  • ip_address(string, optional) - new SDP IP address.

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call. Note that the variable will only be populated in the initial request.

  • ret_var(var, optional) - variable used to print the IP and port the RTPProxy server is using for this call. This is useful especially when using the rtp_cluster, which can advertise multiple servers behind it. The format of the value returned is IP:port. Note that the variable will only be populated in the initial request.

This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.

Example 1.16. rtpproxy_engage usage

...
if (is_method("INVITE") && has_totag()) {
	if ($var(setid) != 0) {
		rtpproxy_engage(,,$var(setid), $var(proxy));
		xlog("SCRIPT: RTPProxy server used is $var(proxy)\n");
	} else {
		rtpproxy_engage();
		xlog("SCRIPT: using default RTPProxy set\n");
	}
}
...
		

1.6.2.  rtpproxy_offer([[flags][, [ip_address][, [set_id][, [sock_var][, [ret_var][, [body_var]]]]]])

Rewrites SDP body to ensure that media is passed through an RTP proxy. To be invoked on INVITE for the cases the SDPs are in INVITE and 200 OK and on 200 OK when SDPs are in 200 OK and ACK.

The function receives the same parameters as rtpproxy_engage(), as well as an extra parameter named body_var - this parameter is used as an in-out variable for the body that should be used to challenge RTP proxy server. If the variable is specified, it is the function uses its content as the body to challenge, and returns the resulted body in it. If not used, the message's body is used, and the outgoing body is changed.

This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.

Example 1.17. rtpproxy_offer usage

route {
...
    if (is_method("INVITE")) {
        if (has_body("application/sdp")) {
            if (rtpproxy_offer())
                t_on_reply("1");
        } else {
            t_on_reply("2");
        }
    }
    if (is_method("ACK") && has_body("application/sdp"))
        rtpproxy_answer();
...
}

onreply_route[1]
{
...
    if (has_body("application/sdp"))
        rtpproxy_answer();
...
}

onreply_route[2]
{
...
    if (has_body("application/sdp"))
        rtpproxy_offer();
...
}

1.6.3.  rtpproxy_answer([[flags][, [ip_address][, [set_id][, [sock_var][, [ret_var][, [body_var]]]]]]])

Rewrites SDP body to ensure that media is passed through an RTP proxy. To be invoked on 200 OK for the cases the SDPs are in INVITE and 200 OK and on ACK when SDPs are in 200 OK and ACK.

See rtpproxy_offer() function description above for the meaning of the parameters.

This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.

Example 1.18. rtpproxy_answer usage

See rtpproxy_offer() function example above for example.


1.6.4.  rtpproxy_unforce([[set_id][, sock_var]])

Tears down the RTPProxy session for the current call.

Meaning of the parameters is as follows:

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE, FAILURE_ROUTE, BRANCH_ROUTE.

Example 1.19. rtpproxy_unforce usage

...
rtpproxy_unforce();
...

1.6.5.  rtpproxy_stream2uac(prompt_name, count[, [set_id][, sock_var]]), rtpproxy_stream2uas(prompt_name, count[, [set_id][, sock_var]])

Instruct the RTPproxy to stream prompt/announcement pre-encoded with the makeann command from the RTPproxy distribution. The uac/uas suffix selects who will hear the announcement relatively to the current transaction - UAC or UAS. For example invoking the rtpproxy_stream2uac in the request processing block on ACK transaction will play the prompt to the UA that has generated original INVITE and ACK while rtpproxy_stop_stream2uas on 183 in reply processing block will play the prompt to the UA that has generated 183.

Apart from generating announcements, another possible application of this function is implementing music on hold (MOH) functionality. When count is -1, the streaming will be in loop indefinitely until the appropriate rtpproxy_stop_stream2xxx is issued.

In order to work correctly, functions require that the session in the RTPproxy already exists. Also those functions don't alted SDP, so that they are not substitute for calling rtpproxy_offer or rtpproxy_answer.

This function can be used from REQUEST_ROUTE, ONREPLY_ROUTE.

Meaning of the parameters is as follows:

  • prompt_name (string) - name of the prompt to stream. Should be either absolute pathname or pathname relative to the directory where RTPproxy runs.

  • count (int) - number of times the prompt should be repeated. The value of -1 means that it will be streaming in loop indefinitely, until appropriate rtpproxy_stop_stream2xxx is issued.

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

Example 1.20. rtpproxy_stream2xxx usage

...
    if (is_method("INVITE")) {
        rtpproxy_offer();
        if ($rb=~ "0\.0\.0\.0") {
            rtpproxy_stream2uas("/var/rtpproxy/prompts/music_on_hold", -1);
        } else {
            rtpproxy_stop_stream2uas();
        };
    };
...
	    

1.6.6.  rtpproxy_stop_stream2uac([[set_id][, sock_var]]), rtpproxy_stop_stream2uas([[set_id][, sock_var]])

Stop streaming of announcement/prompt/MOH started previously by the respective rtpproxy_stream2xxx. The uac/uas suffix selects whose announcement relatively to tha current transaction should be stopped - UAC or UAS.

Meaning of the parameters is as follows:

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

These functions can be used from REQUEST_ROUTE, ONREPLY_ROUTE.

1.6.7.  rtpproxy_start_recording([[set_id][, [sock_var][, [flags][, [destination][, mediastream]]]]])

This command will send a signal to the RTP-Proxy to record the RTP stream on the RTP-Proxy.

Meaning of the parameters is as follows:

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

  • flags(string, optional) - a list of flags passed to RTPProxy for the recording. Currently only s is supported, and it indicates that RTPProxy should record both audio legs in a single file. Note that this feature is available starting with RTPProxy 2.0.

  • destination(string, optional) - the destination of the recording. If it has the udp:IP:port format, RTPProxy sends the RTP stream to that IP:port remote destination. Otherwise, destination represents the name of the file in the recording directory.

  • mediastream(int, optional) - this parameter is only used if the destination is specified, and represents the index of media stream to record/copy, starting from 1. If this parameter is missing, OpenSIPS instructs RTPProxy to copy all the streams.

This function can be used from REQUEST_ROUTE and ONREPLY_ROUTE.

Example 1.21. rtpproxy_start_recording usage

...
rtpproxy_start_recording();

# copy RTP stream to a different listener
rtpproxy_start_recording(,,,"udp:127.0.0.1:60000");

# copy only first RTP stream (audio stream)
rtpproxy_start_recording(,,,"udp:127.0.0.1:60000", 1);
...
		

1.6.8.  rtpproxy_stats(up_pvar, down_var, sent_var, fail_var[, [set_id][, sock_var]])

This command gathers call RTP statistics from RTP-Proxy.

Meaning of the parameters is as follows:

  • up_var (var) - the variable used to return the packets sent by upstream for this call.

  • down_var (var) - the variable used to return the packets sent by downstream for this call.

  • sent_var (var) - the variable used to return the total number of packets sent for this call.

  • up_var (var) - the variable used to return the number of failed packets for this call.

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, ONREPLY_ROUTE, BRANCH_ROUTE and LOCAL_ROUTE.

Example 1.22. rtpproxy_stats usage

...
rtpproxy_stats($var(up),$var(down),$var(sent),$var(fail));
xlog("RTP statistics for $ci: up=$var(up) down=$var(down) sent=$var(sent) fail=$var(fail)\n");
...
		

1.6.9.  rtpproxy_all_stats(stats_avp[, [set_id][, sock_var]])

This command gathers all RTP statistics available from RTP-Proxy. All the returned values stored in an AVP that can be further read by indexing the AVP.

This command is only available starting with RTPProxy 2.1 realease.

Meaning of the parameters is as follows:

  • stats_avp (var) - an AVP where the statistics will be stored. This AVP can be further indexed to get a specific statistic.

  • set_id(int, optional) - the set used for this call.

  • sock_var(var, optional) - variable used to store the RTPProxy socket chosen for this call.

This function can be used from REQUEST_ROUTE, FAILURE_ROUTE, ONREPLY_ROUTE, BRANCH_ROUTE and LOCAL_ROUTE.

Each statistic is stored at a specific index as it follows:

  • ttl - $avp(ret) / $(avp(ret)[0])

  • pkts_ia - $(avp(ret)[1])

  • pkts_io - $(avp(ret)[2])

  • relayed - $(avp(ret)[3])

  • dropped - $(avp(ret)[4])

  • rtpa_set - $(avp(ret)[5])

  • rtpa_rcvd - $(avp(ret)[6])

  • rtpa_dups - $(avp(ret)[7])

  • rtpa_lost - $(avp(ret)[8])

  • rtpa_perrs - $(avp(ret)[9])

Example 1.23. rtpproxy_all_stats usage

...
rtpproxy_all_stats($avp(stats));
xlog("RTP statistics for $ci: dropped=$(avp(stats)[4])\n");
...
		

1.7. Exported MI Functions

1.7.1. rtpproxy_enable

Enables/Disables a rtp proxy.

Parameters:

  • url - the rtp proxy url (exactly as defined in the config file).

  • enable - 1 - enable, 0 - disable. the config file).

  • setid (optional) - the rtpproxy set ID (used for better indentification of the rtpproxy instance to be enabled, for example when a rtpproxy is used in multiple sets).

NOTE: if a rtpproxy is defined multiple times (in the same or different set), all its instances will be enables/disabled IF no set ID provided (as second param).

Example 1.24.  rtpproxy_enable usage

...
## disable a RTPProxy by URL only
$ opensips-cli -x mi rtpproxy_enable udp:192.168.2.133:8081 0
## disable a RTPProxy by URL and set ID (3)
$ opensips-cli -x mi rtpproxy_enable udp:192.168.2.133:8081 0 3
...
			

1.7.2. rtpproxy_show

Displays all the rtp proxies and their information: set and status (disabled or not, weight and recheck_ticks).

No parameter.

Example 1.25.  rtpproxy_show usage

...
$ opensips-cli -x mi rtpproxy_show
...
			

1.7.3. rtpproxy_reload

Reload rtp proxies sets from database. The function will delete all previous records and populate the list with the entries from the database table. The db_url parameter must be set if you want to use this command.

No parameter.

Example 1.26.  rtpproxy_reload usage

...
$ opensips-cli -x mi rtpproxy_reload
...
			

1.8. Exported Events

1.8.1.  E_RTPPROXY_STATUS

This event is raised when a RTPProxy server changes it's status to enabled/disabled.

Parameters:

  • socket - the socket that identifies the RTPProxy instance.

  • status - active if the RTPProxy instance responds to probing or inactive if the instance was deactivated.

1.8.2.  E_RTPPROXY_DTMF

This event is raised when a RTPProxy server sends a DTMF notification to OpenSIPS. In order to catch RFC 2833/4733 DTMF events, you need to provide the d flag to rtpproxy_offer()/ rtpproxy_answer().

Parameters:

  • digit - the digit pressed.

  • duration - the duration of the event.

  • volume - the volume of the event.

  • id - represents the identifier of the call for which that event was received.

  • is_callid - is 0 if the id parameter represents the Dialog ID, or 1 if it is a callid.

  • stream - indicates the stream index of the RTPProxy session. It is normally 0 if the caller sent the DTMF, or 1 if the callee sent it.

Chapter 2. Frequently Asked Questions

2.1.

What happened with rtpproxy_disable parameter?

It was removed as it became obsolete - now rtpproxy_sock can take empty value to disable the rtpproxy functionality.

2.2.

Where can I find more about OpenSIPS?

Take a look at https://opensips.org/.

2.3.

Where can I post a question about this module?

First at all check if your question was already answered on one of our mailing lists:

E-mails regarding any stable OpenSIPS release should be sent to and e-mails regarding development versions should be sent to .

If you want to keep the mail private, send it to .

2.4.

How can I report a bug?

Please follow the guidelines provided at: https://github.com/OpenSIPS/opensips/issues.

Chapter 3. Contributors

3.1. By Commit Statistics

Table 3.1. Top contributors by DevScore(1), authored commits(2) and lines added/removed(3)

 NameDevScoreCommitsLines ++Lines --
1. Razvan Crainea (@razvancrainea)25615960982857
2. Maksym Sobolyev (@sobomax)5485016258
3. Bogdan-Andrei Iancu (@bogdan-iancu)2723123116
4. Liviu Chircu (@liviuchircu)2520113203
5. Vlad Patrascu (@rvlad-patrascu)238362699
6. Peter Lemenkov (@lemenkov)756059
7. Ovidiu Sas (@ovidiusas)753122
8. Vlad Paiu (@vladpaiu)64159
9. Ryan Bullock (@rrb3942)42689
10. John Burke (@john08burke)4286

All remaining contributors: robdyck, Dave Sidwell (@davesidwell), Ezequiel Lovelle (@lovelle), Christophe Sollet (@csollet), Anca Vamanu, Mikko Lehto, Dan Pascu (@danpascu), Walter Doekes (@wdoekes), Dusan Klinec (@ph4r05), Julián Moreno Patińo, Zero King (@l2dy).

(1) DevScore = author_commits + author_lines_added / (project_lines_added / project_commits) + author_lines_deleted / (project_lines_deleted / project_commits)

(2) including any documentation-related commits, excluding merge commits. Regarding imported patches/code, we do our best to count the work on behalf of the proper owner, as per the "fix_authors" and "mod_renames" arrays in opensips/doc/build-contrib.sh. If you identify any patches/commits which do not get properly attributed to you, please submit a pull request which extends "fix_authors" and/or "mod_renames".

(3) ignoring whitespace edits, renamed files and auto-generated files

3.2. By Commit Activity

Table 3.2. Most recently active contributors(1) to this module

 NameCommit Activity
1. Razvan Crainea (@razvancrainea)Mar 2011 - Nov 2023
2. Maksym Sobolyev (@sobomax)Mar 2011 - Mar 2023
3. Liviu Chircu (@liviuchircu)Jul 2012 - Sep 2022
4. Peter Lemenkov (@lemenkov)Dec 2011 - Apr 2022
5. John Burke (@john08burke)Apr 2021 - Apr 2021
6. Ovidiu Sas (@ovidiusas)Mar 2011 - Jun 2020
7. Bogdan-Andrei Iancu (@bogdan-iancu)Mar 2011 - Apr 2020
8. robdyckApr 2020 - Apr 2020
9. Zero King (@l2dy)Mar 2020 - Mar 2020
10. Vlad Patrascu (@rvlad-patrascu)May 2017 - Nov 2019

All remaining contributors: Dan Pascu (@danpascu), Ryan Bullock (@rrb3942), Julián Moreno Patińo, Vlad Paiu (@vladpaiu), Dusan Klinec (@ph4r05), Dave Sidwell (@davesidwell), Ezequiel Lovelle (@lovelle), Mikko Lehto, Walter Doekes (@wdoekes), Christophe Sollet (@csollet), Anca Vamanu.

(1) including any documentation-related commits, excluding merge commits

Chapter 4. Documentation

4.1. Contributors

Last edited by: Razvan Crainea (@razvancrainea), Liviu Chircu (@liviuchircu), Maksym Sobolyev (@sobomax), Zero King (@l2dy), Vlad Patrascu (@rvlad-patrascu), Peter Lemenkov (@lemenkov), Julián Moreno Patińo, Bogdan-Andrei Iancu (@bogdan-iancu), Mikko Lehto, Ryan Bullock (@rrb3942), Ovidiu Sas (@ovidiusas).

Documentation Copyrights:

Copyright © 2005 Voice Sistem SRL

Copyright © 2003-2008 Sippy Software, Inc.