[OpenSER-Users] Snom number-guessing and OpenSER
Klaus Darilion
klaus.mailinglists at pernau.at
Mon Oct 8 08:37:45 CEST 2007
Some hints:
A reply should have a to-tag.
Openser adds a Via header during forwarding (with a generated
branch.id). This branch.id is also used for transaction matching.
regards
klaus
Edoardo Serra schrieb:
> Hi all,
> I'm trying to develop an extension to support SNOM's number guessing
> feature (I don't know if it's somehow a standard but description on how
> it works is here:
> http://kb.snom.com/kb/index.php?View=entry&CategoryID=14&EntryID=14)
>
> As I have to do some 'complicated' db queries I was thinking to use PERL
> module to handle number guessing request from the phone.
>
> I see there's no way (please correct me if I'm wrong) from OpenSER,
> neither from OpenSER::Message, to send a stateless reply with a
> customized body (SNOM says that possible number completion shoud be
> included in the body of a 200 OK reply).
>
> For this reason I have to use Net::SIP to generate the reply packet but
> I'm doing something wrong as OpenSER is not forwarding it back to the
> client.
>
> Test client is a Snom 360 and is behind a NAT, OpenSER has a public IP
>
> Here is my routing logic in openser.cfg
>
> ------------------- BEGIN openser.cfg
> route{
>
> if (!mf_process_maxfwd_header("10")) {
> sl_send_reply("483","Too Many Hops");
> exit;
> };
> if (msg:len >= 2048 ) {
> sl_send_reply("513", "Message too big");
> exit;
> };
>
> if (nat_uac_test("19")) {
> fix_nated_contact();
> force_rport();
> setbflag(6);
> }
>
>
> if (method=="PUBLISH") {
> if ($hdr(Event)=="number-guessing") {
> log("- Initial PUBLISH\n");
> t_newtran();
> t_on_reply("1");
> perl_exec("numberguessing");
> exit;
> }
> sl_send_reply("501", "Not implemented");
> exit;
> }
>
> if (method=="REGISTER") {
> if (nat_uac_test("19")) {
> fix_nated_contact();
> force_rport();
> setbflag(6);
> }
> save("location");
> exit;
> };
>
> exit;
> }
>
> route[1] {
> log("--------------------- Stateful Reply\n");
> if (!t_relay()) {
> sl_reply_error();
> };
> exit;
> }
> ------------------- END openser.cfg
>
> Here is my Simple Perl
>
>
> ------------------- BEGIN net-sip.pl
> use OpenSER qw ( log );
> use OpenSER::Constants;
> use Net::SIP;
>
> # Predefined body, not querying db yet
> my $body = '"Franky Chang" sip:101 at 192.168.0.1;user=phone
> "Steven Jones" sip:102 at 192.168.0.1;user=phone
> "Marie Sun" sip:103 at 192.168.0.1;user=phone
> ';
>
>
> sub numberguessing {
> my $m = shift;
> my $pkt = Net::SIP::Request->new( $m->getMessage() );
> my $resp = $pkt->create_response(200, "OK");
> $resp->set_body($body);
> $resp->add_header('Content-Type','application/number-guessing');
>
> my $leg = Net::SIP::Leg->new(
> addr => '111.222.333.444', port => '5061');
>
> $leg->deliver( $resp, '111.222.333.444:5060' );
>
> # 111.222.333.444 is the IP of OpenSER
> # I'm sending from port 5061 to port 5060
>
> return 1;
> }
> ------------------- END net-sip.pl
>
> OpenSER in verbose debugging module says that it cannot find a matching
> transaction for the 200 OK reply (probably because is originated from
> port 5061 and it has never forwarded it to that port ? )
>
> Here is OpenSER DEBUG log:
>
> 0(24828) SIP Reply (status):
> 0(24828) version: <SIP/2.0>
> 0(24828) status: <200>
> 0(24828) reason: <OK>
> 0(24828) parse_headers: flags=2
> 0(24828) get_hdr_field: cseq <cseq>: <1> <PUBLISH>
> 0(24828) DEBUG:parse_to:end of header reached, state=10
> 0(24828) DBUG:parse_to: display={"Edoardo"},
> ruri={sip:eserra at 111.222.333.444}
> 0(24828) DEBUG: get_hdr_field: <to> [43]; uri=[sip:eserra at 111.222.333.444]
> 0(24828) DEBUG: to body ["Edoardo" <sip:eserra at 111.222.333.444>
> ]
> 0(24828) Found param type 232, <branch> = <z9hG4bK-m3j054b6d8q6>; state=6
> 0(24828) Found param type 235, <rport> = <n/a>; state=17
> 0(24828) end of header reached, state=5
> 0(24828) parse_headers: Via found, flags=2
> 0(24828) parse_headers: this is the first via
> 0(24828) After parse_msg...
> 0(24828) DEBUG:forward_reply: found module tm, passing reply to it
> 0(24828) DEBUG: t_check: start=0xffffffff
> 0(24828) parse_headers: flags=22
> 0(24828) DEBUG: t_reply_matching: failure to match a transaction
> 0(24828) DEBUG: t_check: end=(nil)
> 0(24828) parse_headers: flags=4
> 0(24828) DEBUG: get_hdr_body : content_length=135
> 0(24828) found end of header
> 0(24828) ERROR:forward_reply: no 2nd via found in reply
> 0(24828) DEBUG:destroy_avp_list: destroying list (nil)
> 0(24828) receive_msg: cleaning up
>
> Here is also the tshark dump of the 2 packets (PUBLISH and its reply)
>
> Request-Line: PUBLISH sip:eserra at 213.92.23.108 SIP/2.0
> Message Header
> Via: SIP/2.0/UDP 192.168.254.151:2051;branch=z9hG4bK-ma9r5n0t4jfq;rport
> From: "Edoardo" <sip:eserra at 111.222.333.444>;tag=39wlni6ex1
> To: "Edoardo" <sip:eserra at 111.222.333.444>
> Call-ID: 3c27c039249b-jml9w7t9sywx
> CSeq: 1 PUBLISH
> Max-Forwards: 70
> Event: number-guessing
> Content-Type: application/text
> Content-Length: 25
> Message body
> Number: 10\r\n
> Max-Hits: 3\r\n
>
>
> Status-Line: SIP/2.0 200 OK
> Message Header
> call-id: 3c27c0daa600-emnlo1xcejtn
> cseq: 1 PUBLISH
> from: "Edoardo" <sip:eserra at 111.222.333.444>;tag=6c1y8pp3fb
> to: "Edoardo" <sip:eserra at 111.222.333.444>
> via: SIP/2.0/UDP 192.168.254.151:2051;branch=z9hG4bK-623oddiyzg56;rport
> content-type: application/number-guessing
> Content-Length: 135
> Message body
> "Franky Chang" sip:101 at 192.168.0.1;user=phone\n
> "Steven Jones" sip:102 at 192.168.0.1;user=phone\n
> "Marie Sun" sip:103 at 192.168.0.1;user=phone\n
>
> Hope this info is enough for a debug :)
>
> Tnx in advance
>
> Regards
>
> Edoardo Serra
> EXSORSA LLC
>
>
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