[SIPForum-discussion] Sip audio negotiation problem between PBX and MCU (audioconferences)

Antonio Manchon Romero antoniomanchonromero at yahoo.es
Thu Apr 30 11:16:25 UTC 2015 

Hi,
I´d need help to troubleshoot a negotiation issue, were a phone calls to a MCU to make an audio connection.Call´s stablished at G729 30ms. And audio and dtmf tones are correct.But for some phones I´d prefer G722 or G711ulaw or G711alaw instead of G729.
I´m integrating two systems for audio calls, a sip PBX and an Proxy Server vía sip trunk. Proxy Server is a registrar server for MCU (audioconferences).

sip Phone supports: G722, PCMU, PCMA, G729 and other protocols.MCU supports: G7221, SIREN22, G729, G722, opus, PCMA, PCMU

PBX has been configured to allow any audio codec with 64kpbs as maximum bandwith compression.  And PBX has forced packetization time to 30 ms. Sip-trunk from PBX to Proxy Server is configured with early offer as needed for calls from determined places to MCU.

Call flow: phone --> PBX (sip-trunk Early Offer) --> Proxy Server --> MCU
Here I paste sip traces taken at PBX. In this example call has connected with G729 30ms, and then it´s been disconnected normally.

Some fields have been substituted by descripting names: 

Calling_Phone_Name
Calling_Numbercalled_numberPBX_signalling_ip_addressproxy_server_ip_addressMCU_signalling_ip_address
MCU_media_ip_address
INVITE sip:called_number at proxy_server_ip_address:5060 SIP/2.0
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a6ba75c4b95b
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>
Date: Thu, 30 Apr 2015 10:10:57 GMT
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
Supported: timer,resource-priority,replaces
Min-SE:  180
User-Agent: PBX
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
CSeq: 101 INVITE
Expires: 180
Allow-Events: presence
Supported: X-pbx-srtp-fallback,X-pbx-original-called
Call-Info: <sip:PBX_signalling_ip_address:5060>;method="NOTIFY;Event=telephone-event;Duration=500"
pbx-Guid: 0808637440-0000065536-0000144815-0202899735
Session-Expires:  1800
P-Asserted-Identity: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>
Remote-Party-ID: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;party=calling;screen=yes;privacy=off
Contact: <sip:Calling_Number at PBX_signalling_ip_address:5060>
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 406

v=0
o=pbxSystemsCall_Agent-SIP 865212 1 IN IP4 PBX_signalling_ip_address
s=SIP Call
c=IN IP4 Calling_Phone_ip_address
b=TIAS:64000
b=AS:64
t=0 0
m=audio 20488 RTP/AVP 0 8 116 18 101
a=rtpmap:0 PCMU/8000
a=ptime:30
a=rtpmap:8 PCMA/8000
a=ptime:30
a=rtpmap:116 iLBC/8000
a=ptime:20
a=maxptime:100
a=fmtp:116 mode=20
a=rtpmap:18 G729/8000
a=ptime:30
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15


SIP/2.0 180 Ringing
CSeq: 101 INVITE
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>;tag=634f26de
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a6ba75c4b95b
Content-Length: 0



SIP/2.0 200 OK
CSeq: 101 INVITE
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>;tag=634f26de
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a6ba75c4b95b
Allow-Events: conference,refer,conference
User-Agent: MCU_version
P-RMX-Info: m,c,128000,72,a
Allow: INVITE,ACK,BYE,CANCEL,INFO,OPTIONS,UPDATE,PRACK,SUBSCRIBE,NOTIFY,BENOTIFY
Require: timer
Supported: X-pbx-callinfo,plcm-ivr-service-provider,ms-early-media,replaces,resource-priority,histinfo,ms-safe-transfer,X-pbx-sis-5.1.0,tdialog,timer,100rel,X-pbx-srtp-fallback,ms-conf-invite,ms-sender
Contact: "inbound" <sip:called_number at proxy_server_ip_address:5060;transport=udp>
Content-Type: application/sdp
Session-Expires: 1800;refresher=uac
Content-Length: 262

v=0
o=- 1430388657 88866816 IN IP4 MCU_signalling_ip_address
s=SIP Call
c=IN IP4 MCU_media_sip_address
b=AS:8
t=0 0
m=audio 49288 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=maxptime:30
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=vnd.polycom.PlcmMaskCap:0011
a=sendrecv


ACK sip:called_number at proxy_server_ip_address:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a6bd7cc5bf3c
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>;tag=634f26de
Date: Thu, 30 Apr 2015 10:10:57 GMT
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
Max-Forwards: 70
CSeq: 101 ACK
Allow-Events: presence
Content-Length: 0



INVITE sip:Calling_Number at PBX_signalling_ip_address:5060 SIP/2.0
Via: SIP/2.0/UDP proxy_server_ip_address:5060;branch=z9hG4bK-3739-3ca9e7aba03c8134034c251595d8e028
CSeq: 1 INVITE
From: <sip:called_number at proxy_server_ip_address>;tag=634f26de
To: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
Allow-Events: conference,refer,conference
User-Agent: MCU_version
P-RMX-Info: i,c,128000,32,a
Allow: INVITE,ACK,BYE,CANCEL,INFO,OPTIONS,UPDATE,PRACK,SUBSCRIBE,NOTIFY,BENOTIFY
Supported: X-pbx-callinfo,ms-early-media,plcm-ivr-service-provider,replaces,resource-priority,histinfo,ms-safe-transfer,X-pbx-sis-5.1.0,tdialog,timer,100rel,X-pbx-srtp-fallback,ms-conf-invite,ms-sender,tdialog
Referred-By: <sip:called_number at proxy_server_ip_address:5060;/vmr;transport=UDP>
Plcm-Call-ID: 6ac0899a-0b0d-412f-852e-5e3f00db515b
Contact: "inbound" <sip:called_number at proxy_server_ip_address:5060;transport=udp>;isfocus
Max-Forwards: 69
Content-Type: application/sdp
Session-Expires: 1800;refresher=uas
Min-Expires: 90
Content-Length: 875

v=0
o=- 1430388657 88866817 IN IP4 MCU_signalling_ip_address
s=rmx2k Conf
c=IN IP4 MCU_media_sip_address
b=AS:32
t=0 0
m=audio 49290 RTP/AVP 104 105 114 113 103 102 18 9 127 8 0 98 101
a=rtpmap:104 G7221/16000
a=fmtp:104 bitrate=32000
a=rtpmap:105 SIREN22/48000
a=fmtp:105 bitrate=32000
a=rtpmap:114 G7221/32000
a=fmtp:114 bitrate=32000
a=rtpmap:113 G7221/32000
a=fmtp:113 bitrate=24000
a=rtpmap:103 G7221/16000
a=fmtp:103 bitrate=24000
a=rtpmap:102 G7221/16000
a=fmtp:102 bitrate=16000
a=rtpmap:18 G729/8000
a=maxptime:30
a=rtpmap:9 G722/8000
a=rtpmap:127 opus/48000/2
a=fmtp:127 sprop-maxplaybackrate=48000; maxaveragebitrate=32000; sprop-stereo=0; stereo=0
a=ptime:1
a=rtpmap:8 PCMA/8000
a=ptime:20
a=rtpmap:0 PCMU/8000
a=rtpmap:98 SIREN14/16000
a=fmtp:98 bitrate=32000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=vnd.polycom.PlcmMaskCap:0011
a=sendrecv


SIP/2.0 100 Trying
Via: SIP/2.0/UDP proxy_server_ip_address:5060;branch=z9hG4bK-3739-3ca9e7aba03c8134034c251595d8e028
From: <sip:called_number at proxy_server_ip_address>;tag=634f26de
To: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
Date: Thu, 30 Apr 2015 10:11:09 GMT
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
CSeq: 1 INVITE
Allow-Events: presence
Content-Length: 0



SIP/2.0 200 OK
Via: SIP/2.0/UDP proxy_server_ip_address:5060;branch=z9hG4bK-3739-3ca9e7aba03c8134034c251595d8e028
From: <sip:called_number at proxy_server_ip_address>;tag=634f26de
To: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
Date: Thu, 30 Apr 2015 10:11:09 GMT
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
CSeq: 1 INVITE
Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER, SUBSCRIBE, NOTIFY
Allow-Events: presence
Supported: replaces
Supported: X-pbx-srtp-fallback
Supported: Geolocation
Session-Expires:  1800;refresher=uas
Require:  timer
P-Asserted-Identity: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>
Remote-Party-ID: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;party=called;screen=yes;privacy=off
Contact: <sip:Calling_Number at PBX_signalling_ip_address:5060>
Content-Type: application/sdp
Content-Length: 243

v=0
o=pbxSystemsCall_Agent-SIP 865212 2 IN IP4 PBX_signalling_ip_address
s=SIP Call
c=IN IP4 Calling_Phone_ip_address
b=AS:8
t=0 0
m=audio 20488 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=ptime:30
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15


ACK sip:Calling_Number at PBX_signalling_ip_address:5060 SIP/2.0
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
CSeq: 1 ACK
Via: SIP/2.0/UDP proxy_server_ip_address:5060;branch=z9hG4bK-3739-a27c389a0eaf38ae5e8d6be5c2d1f79c
From: <sip:called_number at proxy_server_ip_address>;tag=634f26de
To: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
Max-Forwards: 70
Content-Length: 0



BYE sip:called_number at proxy_server_ip_address:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a88b1d3ee38
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>;tag=634f26de
Date: Thu, 30 Apr 2015 10:11:09 GMT
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
User-Agent: PBX
Max-Forwards: 70
P-Asserted-Identity: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>
CSeq: 102 BYE
Reason: Q.850;cause=16
Content-Length: 0



SIP/2.0 200 OK
CSeq: 102 BYE
Call-ID: 3032d400-5411ffb1-273ab-c180117 at PBX_signalling_ip_address
From: "Calling_Phone_Name" <sip:Calling_Number at PBX_signalling_ip_address>;tag=865212~e390a5a7-d5c3-4e13-afd1-f8f73d1be093-50102620
To: <sip:called_number at proxy_server_ip_address>;tag=634f26de
Via: SIP/2.0/UDP PBX_signalling_ip_address:5060;branch=z9hG4bK6a88b1d3ee38
Content-Length: 0
***********************************************
Thanks for your help in advance,
Regards,




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