sipmsgops Module

The following modules must be loaded before this module:

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

Filters multipart body by leaving out all other body parts except the first body part of given type.

Meaning of the parameters is as follows:

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

...
if (has_body("multipart/mixed")) {
    if (filter_body("application/sdp") {
        remove_hf("Content-Type");
        append_hf("Content-Type: application/sdp\r\n");
    } else {
        xlog("Body part application/sdp not found\n");
    }
}
...

Append txt as header to all replies that will be generated by OpenSIPS for this request.

Meaning of the parameters is as follows:

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

...
append_to_reply("Foo: bar\r\n");
append_to_reply("Foo: $rm at $Ts\r\n");
...

Appends 'txt' as header after the last header field.

Meaning of the parameters is as follows:

Note: Headers which are added in main route cannot be removed in further routes (e.g. failure routes). So, the idea is not to add there any headers that you might want to remove later. To add headers temporarely use the branch route because the changes you do there are per-branch.

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

...
append_hf("P-hint: VOICEMAIL\r\n");
append_hf("From-username: $fU\r\n");
...

Appends 'txt' as header after first 'hdr' header field.

Meaning of the parameters is as follows:

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

...
append_hf("P-hint: VOICEMAIL\r\n", "Call-ID");
append_hf("From-username: $fU\r\n", "Call-ID");
...

Inserts 'txt' as header before the first header field.

Meaning of the parameters is as follows:

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

...
insert_hf("P-hint: VOICEMAIL\r\n");
insert_hf("To-username: $tU\r\n");
...

Inserts 'txt' as header before first 'hdr' header field.

Meaning of the parameters is as follows:

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

...
insert_hf("P-hint: VOICEMAIL\r\n", "Call-ID");
insert_hf("To-username: $tU\r\n", "Call-ID");
...

Append header field name with original Request-URI in middle.

Meaning of the parameters is as follows:

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

...
append_urihf("CC-Diversion: ", "\r\n");
...

Return true if a header field is present in message.

Meaning of the parameters is as follows:

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

...
if (is_present_hf("From")) log(1, "From HF Present");
...

Adds a time header to the reply of the request. You must use it before functions that are likely to send a reply, e.g., save() from 'registrar' module. Header format is: “Date: %a, %d %b %Y %H:%M:%S GMT”, with the legend:

Return true if a header was successfully appended.

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

...
append_time();
...

Check if the method of the message matches the name. If name is a known method (invite, cancel, ack, bye, options, info, update, register, message, subscribe, notify, refer, prack), the function performs method ID testing (integer comparison) instead of ignore case string comparison.

The 'name' can be a list of methods in the form of 'method1|method2|...'. In this case, the function returns true if the SIP message's method is one from the list. IMPORTANT NOTE: in the list must be only methods defined in OpenSIPS with ID (invite, cancel, ack, bye, options, info, update, register, message, subscribe, notify, refer, prack, publish; for more see: http://www.iana.org/assignments/sip-parameters).

If used for replies, the function tests the value of method field from CSeq header.

Meaning of the parameters is as follows:

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

...
if(is_method("INVITE"))
{
    # process INVITEs here
}
if(is_method("OPTION|UPDATE"))
{
    # process OPTIONs and UPDATEs here
}
...

Remove from message all headers with name “hname”

Returns true if at least one header is found and removed.

Meaning of the parameters is as follows:

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

...
if(remove_hf("User-Agent"))
{
    # User Agent header removed
}
...
# removes X-Billing-Account, X-Billing-Price, X-Billing-rateplan, etc
remove_hf("X-Billing*", "g");
...
#removes headers by regex
remove_hf("^X-g.+[0-9]", "r");
...

The function returns true if the SIP message has a body attached. The checked includes also the “Content-Lenght” header presence and value.

If a parameter is given, the mime described will be also checked against the “Content-Type” header.

If the SIP message has a multipart body and mime is not a multipart type , it will search through all the parts for the given type.

It will not handle multi-layer multiparts

Meaning of the parameters is as follows:

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

...
if(has_body("application/sdp"))
{
    # do interesting stuff here
}
...

The function returns true if the SIP message has an SDP body attached and at least one audio stream in on hold.

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

...
if(is_audio_on_hold())
{
    # do interesting stuff here
}
...

The function returns true if the SIP message has a Privacy header field that includes the given privacy_type among its privacy values. See http://www.iana.org/assignments/sip-priv-values for possible privacy type values.

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

...
if(is_privacy("id"))
{
    # do interesting stuff here
}
...

If the message has a body, this function deletes it, correcting Content-Length. This function also deletes the Content-Type header.

If a MIME type is specified it will delete the body if it has the same type or, if the message has a multipart body it will go through the parts and delete all those with the specified type.

It will not handle multi-layer multiparts

Meaning of the parameters is as follows:

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

...
strip_body();   #delete any body
strip_body("multipart/related") # delete a multipart/related body
strip_body("application/sdp") # delete all sdp bodies, even ones enclosed in multipart
...

This function can be used to add a body to a message. If a body already exists, it will be replaced with the new one. The second parameter is the content type of the new body. It is optional: in case the function is used to replace an existing body with a body of the same type, there is no need to set this parameter. If the message has no body or if the types are different, it is compulsory to set this parameter.

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

...
add_body("Hello World!", "text/plain");
...

The function returns true if the SIP message is properly built according to SIP RFC3261. It verifies if the mandatory headers for each request/reply and can also check the format of the headers body.

The flags parameter received is optional and can be composed with the following values:

The result_pvar parameter sets resulting pvar with text error reason in case of negative result ( easy for logging or propagating the rejection reason back to the bogus UA )

This function can return the following codes:

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

...
if(!sipmsg_validate())
{
	send_reply("400", "Bad Request");
	exit;
}
...

...
# checks also the SDP and headers body
if(!sipmsg_validate("sh"))
{
	send_reply("400", "Bad Request/Body");
	exit;
}
...

This function can be used to verify if a codec exists inside an sdp payload. It will search for the codec inside all streams from all sdp sessions. If it is found anywhere it will return TRUE otherwise it will return FALSE. The second parameter is optional, if it is not supplied any clockrate will match. Parameters are CASE INSENSITIVE.

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

...
codec_exists("speex");
or
codec_exists("GSM","8000");
...

This function can be used to delete a codec from inside an sdp payload. It will search for the codec inside all streams from all sdp sessions. If it is found anywhere it will be deleted from the mapping ("a=...") and from the list of indexes ("m=..."). Returns TRUE if any deletion occurred otherwise it will return FALSE. The second parameter is optional, if it is not supplied any clockrate will match and all will be deleted. Parameters are CASE INSENSITIVE.

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

...
codec_delete("speex");
or
codec_delete("GSM","8000");
...

This function can be used to move a codec up in the list of indexes ("m=..."). It will search for the codec inside all streams from all sdp sessions. If it is found anywhere it will be moved to the top of the index list. Returns TRUE if any moves occurred otherwise it will return FALSE. The second parameter is optional, if it is not supplied any clockrate will match and all codecs will be moved to the front while preserving their original ordering. Parameters are CASE INSENSITIVE.

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

...
codec_move_up("speex");
or
codec_move_up("GSM","8000");
...

This function can be used to move a codec down in the list of indexes ("m=..."). It will search for the codec inside all streams from all sdp sessions. If it is found anywhere it will be moved to the back of the index list. Returns TRUE if any moves occurred otherwise it will return FALSE. The second parameter is optional, if it is not supplied any clockrate will match and all codecs will be moved to the back while preserving their original ordering. Parameters are CASE INSENSITIVE.

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

...
codec_move_down("speex");
or
codec_move_down("GSM","8000");
...

...
/*
  This example will move speex with 8000 codec to the back of the list,
  then it will erase GSM with 8000 clock, and then it will bring all
  speex codecs to the front of the list. Speex/8000 will be behind any
  other speex.
*/
codec_move_down("speex","8000");
codec_delete("GSM","8000");
codec_move_up("speex");
...

This function has the same effect as codec_exists ( without the clock parameter ) the only difference is that it takes a POSIX regular expression as a parameter.

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

...
codec_exists_re("sp[a-z]*");
...

This function has the same effect as codec_delete ( without the clock parameter ) the only difference is that it takes a POSIX regular expression as a parameter.

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

...
codec_delete_re("PCMA|PCMU");
...

This function deletes all the codecs except those specified by the regular expression.

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

...
codec_delete_except_re("PCMA|PCMU");#will delete all codecs except PCMA and PCMU
...

This function has the same effect as codec_move_up ( without the clock parameter ) the only difference is that it takes a POSIX regular expression as a parameter.

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

...
codec_move_up_re("sp[a-z]*");
...

This function has the same effect as codec_move_down ( without the clock parameter ) the only difference is that it takes a POSIX regular expression as a parameter.

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

...
codec_move_down_re("sp[a-z]*");
...

...
/*
  This example will move speex with 8000 codec to the back of the list,
  then it will erase GSM with 8000 clock, and then it will bring all
  speex codecs to the front of the list. Speex/8000 will be behind any
  other speex.
*/
codec_move_down("speex","8000");
codec_delete("GSM","8000");
codec_move_up("speex");
...

Intercept a SIP reply (in any onreply_route) and change its status code and reason phrase prior to propogating it.

Meaning of the parameters is as follows:

This function can be used from ONREPLY_ROUTE.

...
onreply_route {
    if ($rs == "603") {
        change_reply_status("404", "Not Found");
        exit;
    }
}
...
	    

This function can be used to verify if a stream exists inside an sdp payload. It will search for the stream inside all sdp sessions. If it is found anywhere it will return TRUE otherwise it will return FALSE.

Meaning of the parameters is as follows:

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

...
# check for FAX
stream_exists("image");
...

This function can be used to delete a whole stream from inside an sdp payload. It will search for the stream inside all sdp sessions. If it is found anywhere it will be deleted along with all attributes Returns TRUE if any deletion occurred otherwise it will return FALSE.

Meaning of the parameters is as follows:

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

...
# prevent usage of video
stream_delete("video");
...