[Freeswitch-users] Issue with SDP - Call hangs up right after SIP 200 OK

Thu Jul 23 08:35:31 UTC 2020

Hi,

Your call is rejected by the sofia stack without even reaching freeswitch core as the 200 OK is incomplete. You have the following line:

> m=video 0 RTP/AVP 34 0 16 178 64 0 16 178 0 0

But there is not rtpmap for codec 178. It is dynamic payload type so the rtpmap is required. Even the PT 64 is invalid as currently unassigned (https://www.iana.org/assignments/rtp-parameters/rtp-parameters.xhtml#rtp-parameters-1)

Best Regards,
-- 
Valli A. Vallimamod
SIP Solutions
vma at sip.solutions
linkedin.com/in/vallimamod
.

> On 22 Jul 2020, at 22:13, Marc Bernard <marcb at voicemeup.com> wrote:
> 
> Hello People,
>  
> I’ve been investigating an issue with SDP when sending a call to a Panasonic KX-TGP600 Phone, the call end as soon as the Panasonic send it’s SIP OK
>  
> I could not see what is wrong with the SDP and why I get "INVITE: error parsing SDP answer in 200 OK" resulting in "988 Incomplete offer/answer" 
>  
> I also find it weird that there is no output for this error when Sofia debug is not enabled. It took me a while before I thought of trying to enable more debugging.
>  
> There is also the "not found by name */1.1.217.127:1029" Part which I am not sure is related/relevant in this.
>  
> --
>  
> Here is the console log portion that I thought was relevant:
>  
> 2020-07-17 15:44:33.495660 [DEBUG] sofia.c:7325 Channel sofia/private/+15145557030 at 2.2.127.218 <mailto:sofia/private/+15145557030 at 2.2.127.218> entering state [early][180]
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> 2020-07-17 15:44:33.495660 [NOTICE] switch_ivr_originate.c:556 Ring Ready sofia/private/+15145557030 at 2.2.127.218 <mailto:sofia/private/+15145557030 at 2.2.127.218>!
> tport.c:2759 tport_wakeup_pri() tport_wakeup_pri(0x7f0e440044a0): events IN
> tport.c:2882 tport_recv_event() tport_recv_event(0x7f0e440044a0)
> tport_type_udp.c:324 tport_recv_dgram() tport(0x7f0e440044a0): zero length packet
> tport.c:2759 tport_wakeup_pri() tport_wakeup_pri(0x7f0e440044a0): events IN
> tport.c:2882 tport_recv_event() tport_recv_event(0x7f0e440044a0)
> tport.c:3223 tport_recv_iovec() tport_recv_iovec(0x7f0e440044a0) msg 0x7f0e44011e30 from (udp/1.1.131.37:5060) has 845 bytes, veclen = 1
> tport.c:3041 tport_deliver() tport_deliver(0x7f0e440044a0): msg 0x7f0e44011e30 (845 bytes) from udp/1.1.217.127:5060/sip next=(nil)
> nta.c:3304 agent_recv_response() nta: received 200 OK for INVITE (22953743)
> nta.c:3371 agent_recv_response() nta: 200 OK is going to a transaction
> tport.c:4240 tport_release() tport_release(0x7f0e440044a0): 0x7f0e4400bca0 by 0x7f0e44010c40 with 0x7f0e44011e30
> nua_dialog.c:564 nua_dialog_usage_set_refresh_range() nua(): refresh session after 55 seconds (in [55..65])
> soa.c:1171 soa_set_remote_sdp() soa_set_remote_sdp(static::0x7f0e4401a9b0, (nil), 0x7f0e4401267a, 259) called
> nua_session.c:970 nua_session_client_response() nua(0x7f0e48048c30): INVITE: error parsing SDP answer in 200 OK (200)
> nua_stack.c:271 nua_stack_event() nua(0x7f0e48048c30): event r_invite 200 OK
> nua_stack.c:359 nua_application_event() nua: nua_application_event: entering
> nta.c:2670 nta_tpn_by_url() nta: selecting scheme sip
> tport.c:3275 tport_tsend() tport_tsend(0x7f0e440044a0) tpn = */1.1.217.127:1029
> tport.c:4064 tport_resolve() tport_resolve addrinfo = 1.1.217.127:1029
> tport.c:4698 tport_by_addrinfo() tport_by_addrinfo(0x7f0e440044a0): not found by name */1.1.217.127:1029
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> tport.c:3612 tport_vsend() tport_vsend(0x7f0e440044a0): 391 bytes of 391 to udp/1.1.217.127:1029
> tport.c:3510 tport_send_msg() tport_vsend returned 391
> nta.c:8315 outgoing_send() nta: sent ACK (22953743) to */1.1.217.127:1029
> nua_stack.c:271 nua_stack_event() nua(0x7f0e48048c30): event i_media_error 988 Incomplete offer/answer
> nua_params.c:482 nua_stack_set_params() nua: nua_stack_set_params: entering
> soa.c:1784 soa_terminate() soa_terminate(static::0x7f0e4401a9b0) called
> nua_stack.c:359 nua_application_event() nua: nua_application_event: entering
> soa.c:1302 soa_init_offer_answer() soa_init_offer_answer(static::0x7f0e4401a9b0) called
> nta.c:2670 nta_tpn_by_url() nta: selecting scheme sip
> tport.c:3275 tport_tsend() tport_tsend(0x7f0e440044a0) tpn = */1.1.217.127:1029
> tport.c:4064 tport_resolve() tport_resolve addrinfo = 1.1.217.127:1029
> tport.c:4698 tport_by_addrinfo() tport_by_addrinfo(0x7f0e440044a0): not found by name */1.1.217.127:1029
> tport.c:3612 tport_vsend() tport_vsend(0x7f0e440044a0): 616 bytes of 616 to udp/1.1.217.127:1029
> tport.c:3510 tport_send_msg() tport_vsend returned 616
> nta.c:8315 outgoing_send() nta: sent BYE (22953744) to */1.1.217.127:1029
> tport.c:4178 tport_pend() tport_pend(0x7f0e440044a0): pending 0x7f0e4400d880 for udp/1.1.131.37:5060 (already 0)
> nta.c:1348 set_timeout() nta: timer shortened to 1000 ms
> nua_session.c:4140 signal_call_state_change() nua(0x7f0e48048c30): call state changed: proceeding -> terminating, received answer
> soa.c:1098 soa_get_remote_sdp() soa_get_remote_sdp(static::0x7f0e4401a9b0, [0x7f0e705a0778], [0x7f0e705a0780], [(nil)]) called
> soa.c:616 soa_get_params() soa_get_params(static::0x7f0e4401a9b0, ...) called
> nua_stack.c:271 nua_stack_event() nua(0x7f0e48048c30): event i_state 200 OK
> nua_stack.c:359 nua_application_event() nua: nua_application_event: entering
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> nua.c:366 nua_handle_magic() nua: nua_handle_magic: entering
> 2020-07-17 15:44:35.795689 [DEBUG] sofia.c:7325 Channel sofia/public/golfvalneigette3 entering state [terminating][200]
>  
> --
>  
> And here is the SIP OK from the Panasonic:
>  
> &iTEq at 8GæÙ¸ª%ÄÄ]äáSIP/2.0 <mailto:&iTEq at 8G%C3%A6%C3%99%C2%B8%C2%AA%25%C3%84%C3%84]%C3%A4%C3%A1SIP/2.0> 200 OK
> Via: SIP/2.0/UDP 1.1.131.37;rport=5060;branch=z9hG4bKttaHKmXNgBtSQ;received=1.1.131.37
> Call-ID: cbecb6ef-4300-1239-dfa0-000c29124868
> From: "Debug Proxy" <sip:+15145552353 at 1.1.131.37 <sip:+15145552353 at 1.1.131.37>>;tag=rDQF79t14QmKr
> To: <sip:9919605 at dev-proxy.xxx.com <sip:9919605 at dev-proxy.xxx.com>>;tag=1661639224
> CSeq: 22952030 INVITE
> Allow: INVITE,ACK,CANCEL,BYE,PRACK,INFO,UPDATE,OPTIONS,MESSAGE,NOTIFY,REFER
> Supported: 100rel,precondition
> Contact: <sip:Account1 at 192.168.1.193:5060 <sip:Account1 at 192.168.1.193:5060>>
> Require: replaces
> Content-Type: application/sdp
> Server: Panasonic-KX-TGP600/11.110 (4c364e38b998)
> Content-Length: 263
>  
> v=0
> o=- 1595011648 1595011648 IN IP4 192.168.1.193
> s=-
> c=IN IP4 192.168.1.193
> t=0 0
> m=audio 16176 RTP/AVP 0 101
> a=rtpmap:0 PCMU/8000
> a=rtpmap:101 telephone-event/8000
> a=fmtp:101 0-15
> a=sendrecv
> a=ptime:20
> m=video 0 RTP/AVP 34 0 16 178 64 0 16 178 0 0
>  
> --
>  
> I have a PCAP file for the whole call should it be needed.
>  
> Any help resolving this issue would be greatly appreciated.
>  
> Kindly,
>  
> _________________________________________________________________________
> 
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