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[rehfjo at gmail.com]

Hello,
FreeSwitch v. 1.6.20
I'm calling my own mobile no. via my localphone gateway, and while this used to work when I last tested it a while ago, recently the call no longer goes through, with freeswitch dropping the call with the RFC2543 warning and then 'incompatible destination'. Codecs on both sides look good & calling other mobile numbers on other networks via the same gateway works fine, for what it's worth.



The fuller/anonymized paste is at: https://pastebin.freeswitch.org/view/ddafee03 but the bits which I think matter are below.

Could someone give me any hints as to whether this is a FS issue or whether the problem lies with my gateway or otherwise.


Thanks


[*]recv 1205 bytes from udp/[94.0.0.0]:5060 at 10:21:18.751270:
[*]   ------------------------------------------------------------------------
[*]   SIP/2.0 183 Session Progress
[*]   Via: SIP/2.0/UDP 45.0.0.0:5080;rport=5080;branch=z9hG4bKHNUQK4208H7Br
[*]   Record-Route: <sip:95.0.0.0:5070;lr;ftag=lp-2k9-5ee88476-00002a55-0005d2b3R2d70439b.a>,<sip:94.1.1.1;lr=on>,<sip:94.0.0.0;lr=on;ftag=B3N7U1NHeem0F;an=YWJjREVENjg5JiUnPDkyE2laNj48LXtVYWEGaiYpXA-->
[*]   To: <sip:447970000000@proxy.localphone.com ([email]sip%3A447970000000@proxy.localphone.com[/email])>;tag=lp-2k9-5ee88476-00002a55-0005d2b3R2d70439b.b
[*]   From: "Robert" <sip:1234567@localphone.com ([email]sip%3A1234567@localphone.com[/email])>;tag=B3N7U1NHeem0F
[*]   Call-ID: 45818239-b574-1239-8a8e-5600002a6bbb
[*]   CSeq: 29244045 INVITE
[*]   Allow: PUBLISH,MESSAGE,PRACK,SUBSCRIBE,REFER,INFO,NOTIFY,OPTIONS,BYE,INVITE,ACK,CANCEL
[*]   Contact: <sip:94.2.2.2;did=2d6.a9862935>
[*]   Content-Type: application/sdp
[*]   Content-Length: 474
[*]   
[*]   v=0
[*]   o=UK1-SBC-15-1 70259913 70259914 IN IP4 0.0.0.0
[*]   s=sip call
[*]   c=IN IP4 0.0.0.0
[*]   t=0 0
[*]   m=audio 0 RTP/SAVP 18 8 0 101
[*]   a=rtpmap:18 G729/8000
[*]   a=fmtp:18 annexb=no
[*]   a=rtpmap:8 PCMA/8000
[*]   a=rtpmap:0 PCMU/8000
[*]   a=rtpmap:101 telephone-event/8000
[*]   a=fmtp:101 0-15
[*]   a=ptime:20
[*]   m=audio 0 RTP/AVP 18 8 0 101
[*]   a=rtpmap:18 G729/8000
[*]   a=fmtp:18 annexb=no
[*]   a=rtpmap:8 PCMA/8000
[*]   a=rtpmap:0 PCMU/8000
[*]   a=rtpmap:101 telephone-event/8000
[*]   a=fmtp:101 0-15
[*]   a=ptime:20
[*]   a=nortpproxy:yes
[*]   ------------------------------------------------------------------------
[*]2020-12-10 10:21:18.738771 [DEBUG] sofia.c:7084 Channel sofia/external/447970000000 entering state [proceeding][183]
[*]2020-12-10 10:21:18.738771 [NOTICE] sofia.c:7192 Ring-Ready sofia/external/447970000000!
[*]2020-12-10 10:21:18.738771 [DEBUG] switch_channel.c:3346 (sofia/external/447970000000) Callstate Change DOWN -> RINGING
[*]2020-12-10 10:21:18.738771 [DEBUG] sofia.c:7084 Channel sofia/external/447970000000 entering state [proceeding][183]
[*]2020-12-10 10:21:18.738771 [DEBUG] sofia.c:7094 Remote SDP:
[*]v=0                                                                    
[*]o=UK1-SBC-15-1 70259913 70259914 IN IP4 0.0.0.0                        
[*]s=sip call
[*]c=IN IP4 0.0.0.0
[*]t=0 0                                                                  
[*]m=audio 0 RTP/SAVP 18 8 0 101
[*]m=audio 0 RTP/AVP 18 8 0 101                                                                                                                                                                                                    

[*] 
[*]2020-12-10 10:21:18.738771 [WARNING] switch_core_media.c:3951 RFC2543 from March 1999 called; They want their 0.0.0.0 hold method back.....
[*]2020-12-10 10:21:18.738771 [NOTICE] sofia.c:7273 Hangup sofia/external/447970000000 [CS_CONSUME_MEDIA] [INCOMPATIBLE_DESTINATION]
[*]2020-12-10 10:21:18.738771 [DEBUG] switch_core_state_machine.c:584 (sofia/external/447970000000) Running State Change CS_HANGUP (Cur 4 Tot 65)
[*]2020-12-10 10:21:18.738771 [DEBUG] switch_core_state_machine.c:850 (sofia/external/447970000000) Callstate Change RINGING -> HANGUP
[*]2020-12-10 10:21:18.738771 [DEBUG] switch_core_state_machine.c:852 (sofia/external/447970000000) State HANGUP
[*]2020-12-10 10:21:18.738771 [DEBUG] mod_sofia.c:438 Channel sofia/external/447970000000 hanging up, cause: INCOMPATIBLE_DESTINATION

[rehfjo at gmail.com]

Hello,
Replying to my own message in case it helps anyone else. Updated to FS 1.10.5 - issue persists.


Digging a little, it possibly looks like FS doesn't like the m=...SAVP without any crypto lines? Not sure... I don't think it was related to the RFC2543 warning.
setting rtp_secure_media_outbound=forbidden on the bridge call to the gateway, meaning FS sends only RTP/AVP, I get back a more normal looking 183, and the call proceeds as normal.

I don't know enough about the SIP spec to be able to tell if my gateway returning an m= ..SAVP line without any accompanying crypto lines is valid or not - or even if this was the definite cause of the problem, but it's solved.
Regards
RF.



On Fri, 11 Dec 2020 at 14:31, Robert Fitzjohn <rehfjo@gmail.com (rehfjo@gmail.com)> wrote: