[OpenSIPS-Users] OpenSIPS as Teams SBC

James Hogbin james at ip-sentinel.com
Mon May 11 22:44:12 EST 2020 

OK.  On the Freeswitch side there is a double transport=tls but I can’t find out where that’s happening so I’ll remove it in the Opensips script

Here’s what Opensips sees from Freeswitch

James Hogbin
Director 
 
IP Sentinel 
t. +44 (0)20 3011 4150
m. +44 7786910895
w. https://www.ip-sentinel.com

INVITE sip:08435577721 at sbc.ip-sentinel.com:5091;transport=tls SIP/2.0
Via: SIP/2.0/TLS 13.80.245.144:5081;rport;branch=z9hG4bKK90SUgZ4ZmN1D
Max-Forwards: 68
From: "James Hogbin" <sip:+442030114146 at 13.80.245.144>;tag=t4ce3rS0Fy3ga
To: <sip:08435577721 at sbc.ip-sentinel.com:5091>
Call-ID: 86371d7b-0e76-1239-bdba-000d3aada04e
CSeq: 20063606 INVITE
Contact: <sip:gw+c6ff36e8-d3de-4fe0-9f1b-9da2888c43a9 at 13.80.245.144:5081;transport=tls;transport=tls;gw=c6ff36e8-d3de-4fe0-9f1b-9da2888c43a9>
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 1317
X-FS-Support: update_display,send_info
Remote-Party-ID: "James Hogbin" <sip:+442030114146 at 13.80.245.144>;party=calling;screen=yes;privacy=off
v=0
o=FreeSWITCH 1589217436 1589217437 IN IP4 13.80.245.144
s=FreeSWITCH
c=IN IP4 13.80.245.144
t=0 0
m=audio 17360 RTP/SAVP 9 0 8 101 13
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=crypto:1 {removed]
a=ptime:20
m=audio 17360 RTP/AVP 9 0 8 101 13
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=ptime:20


Here is my script.  I’m not fixing FROM or TO.  I am fixing the number, the Record_Route & the duplicated transport=tls in the CONTACT

if (is_method("INVITE") && !has_totag() && check_source_address(0)) {
                xlog("[ROUTE]Incoming call to MS: RURI=$ruri, SI=$si, M=$rm\n");
                trace("tid");
                strip(1);
                prefix("+44");

$rd="sip.pstnhub.microsoft.com<http://sip.pstnhub.microsoft.com>";
                $rp=5061;

                $var(reg_input) = $ct;
                $var(reg)= "/transport=tls;transport=tls;/transport=tls;/g";
                xlog("[WARNING]Applying reg exp $var(reg) to $var(reg_input)");
                $var(reg_output) = $(var(reg_input){re.subst,$var(reg)});
                remove_hf("Contact");
                append_hf("Contact: $var(reg_output)");

                record_route_preset("sbc.ip-sentinel.com:5091<http://sbc.ip-sentinel.com:5091>;transport=tls");

                route(relay);

The RTP_Proxy seems to be updating the SDP correctly

And here is the invite to teams

INVITE sip:+448435577721 at sip.pstnhub.microsoft.com:5061;transport=tls SIP/2.0
Record-Route: <sip:sbc.ip-sentinel.com:5091;transport=tls;ftag=t4ce3rS0Fy3ga;lr;vsf=TxoZShEfAAYCAwMBAAUFBQJ2cUBMWx5HQhlGS19AXW5lbC5jb206NTA5MT4-;vst=TxoZSgoTAAcNAQQCAgUGd0FTI10AAAMDFhoaARsHQkMKDB9VRl9fRS5jb20+>
Via: SIP/2.0/TLS 137.117.136.143:5091;branch=z9hG4bK9915.ccfe3523.0;i=ae435223
Via: SIP/2.0/TLS 13.80.245.144:5081;received=13.80.245.144;rport=36423;branch=z9hG4bKK90SUgZ4ZmN1D
Max-Forwards: 68
From: "James Hogbin" <sip:+442030114146 at sbc.ip-sentinel.com:5091>;tag=t4ce3rS0Fy3ga
To: <sip:+448435577721 at sip.pstnhub.microsoft.com>
Call-ID: 86371d7b-0e76-1239-bdba-000d3aada04e
CSeq: 20063606 INVITE
User-Agent: FreeSWITCH
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Supported: timer, path, replaces
Allow-Events: talk, hold, conference, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 1339
X-FS-Support: update_display,send_info
Remote-Party-ID: "James Hogbin" <sip:+442030114146 at 13.80.245.144>;party=calling;screen=yes;privacy=off
Contact: <sip:gw+c6ff36e8-d3de-4fe0-9f1b-9da2888c43a9 at 13.80.245.144:5081;transport=tls;gw=c6ff36e8-d3de-4fe0-9f1b-9da2888c43a9>
v=0
o=FreeSWITCH 1589217436 1589217437 IN IP4 137.117.136.143
s=FreeSWITCH
c=IN IP4 137.117.136.143
t=0 0
m=audio 10124 RTP/SAVP 9 0 8 101 13
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=crypto:1 {removed}
a=ptime:20
m=audio 19352 RTP/AVP 9 0 8 101 13
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=ptime:20
a=nortpproxy:yes


I don’t even get a response from Teams now so I think I’m now going backwards even though I think I’ve implemented all the parts of the advice I’ve been given throughout this thread.

   0.00 Freeswitch => INVITE => Opensips
   0.01 Freeswitch <=   100  <= Opensips
   0.01                         Opensips => INVITE => MSTeams
30.0    Freeswitch <=   408  <= Opensips
30.0    Freeswitch =>   ACK  => Opensips
31.4    Freeswitch =>   ACK  => Opensips

James

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