[Freeswitch-users] No audio on caller side when both side support speex/8000 only

Wed Sep 9 04:19:38 PDT 2009

Hi,

Owe to the network bandwidth limitations (running on cellular phones
ip link) we are using speex/8000 as our voice codec.

However, when both parties are using that codec the sound is not to be
heard on the caller side.

looking at the log dumps one can see that

a) at the caller side, it supports speex/8000 in pt=102 and receives
from the server speex/8000 in pt=102
b) at the callee side FreeSwitch supports support speex/8000 in pt=98
although it receives from the client speex/8000 in pt=102

When the voice starts caller sends RTP with pt=102 and expect to
receive RTP with pt=102, while the callee sends RTP with pt=98 and
expect to receive RTP with pt=102.

The RTP packets that received in the caller side are with pt=98
instead of 102 and thusly the client drops them.

Attached are the 2 files recorded from a call between 2 pjsip clients
that support only speex/8000 codec.

un_FSCallerSide-speexClient.TXT – is the caller side SIP messages.

un_FSAnswerSide-speexClient.TXT – is the answer side of SIP messages.

Is there anything can be done at the configuration level to avoid this?
Thanks in advance for your help

/tzury
-------------- next part --------------
--start msg (RX)--
INVITE sip:1002 at 95.35.241.89:5060 SIP/2.0
Via: SIP/2.0/UDP 67.23.5.142;rport;branch=z9hG4bKgvD702De7e0Se
Max-Forwards: 69
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89:5060>
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
CSeq: 120120747 INVITE
Contact: <sip:mod_sofia at 67.23.5.142:5060>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 415
Remote-Party-ID: "Extension 1001" <sip:1001 at 67.23.5.142>;screen=yes;privacy=off

v=0
o=FreeSWITCH 4131815555116427886 953315150658749217 IN IP4 67.23.5.142
s=FreeSWITCH
c=IN IP4 67.23.5.142
t=0 0
m=audio 26662 RTP/AVP 98 0 8 3 9 99 103 101 13
a=rtpmap:98 SPEEX/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:9 G722/8000
a=rtpmap:99 SPEEX/16000
a=rtpmap:103 SPEEX/32000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=ptime:20

--end msg--
--start msg (TX)--
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 67.23.5.142;rport=5060;received=67.23.5.142;branch=z9hG4bKgvD702De7e0Se
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89>
CSeq: 120120747 INVITE
Content-Length:  0

--end msg--
--start msg (TX)--
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 67.23.5.142;rport=5060;received=67.23.5.142;branch=z9hG4bKgvD702De7e0Se
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89>;tag=e4f9fb648edef1c48dbc8b8b474409e6
CSeq: 120120747 INVITE
Contact: <sip:95.35.241.89:5060>
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Content-Length:  0

--end msg--
--start msg (RX)--
INVITE sip:1002 at 95.35.241.89:5060 SIP/2.0
Via: SIP/2.0/UDP 67.23.5.142;rport;branch=z9hG4bKgvD702De7e0Se
Max-Forwards: 69
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89:5060>
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
CSeq: 120120747 INVITE
Contact: <sip:mod_sofia at 67.23.5.142:5060>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 415
Remote-Party-ID: "Extension 1001" <sip:1001 at 67.23.5.142>;screen=yes;privacy=off

v=0
o=FreeSWITCH 4131815555116427886 953315150658749217 IN IP4 67.23.5.142
s=FreeSWITCH
c=IN IP4 67.23.5.142
t=0 0
m=audio 26662 RTP/AVP 98 0 8 3 9 99 103 101 13
a=rtpmap:98 SPEEX/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:3 GSM/8000
a=rtpmap:9 G722/8000
a=rtpmap:99 SPEEX/16000
a=rtpmap:103 SPEEX/32000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=rtpmap:13 CN/8000
a=ptime:20

--end msg--
--start msg (TX)--
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 67.23.5.142;rport=5060;received=67.23.5.142;branch=z9hG4bKgvD702De7e0Se
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89>;tag=e4f9fb648edef1c48dbc8b8b474409e6
CSeq: 120120747 INVITE
Contact: <sip:95.35.241.89:5060>
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Content-Length:  0

--end msg--
--start msg (TX)--
SIP/2.0 200 OK
Via: SIP/2.0/UDP 67.23.5.142;rport=5060;received=67.23.5.142;branch=z9hG4bKgvD702De7e0Se
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89>;tag=e4f9fb648edef1c48dbc8b8b474409e6
CSeq: 120120747 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Contact: <sip:95.35.241.89:5060>
Supported: replaces, 100rel, timer, norefersub
Content-Type: application/sdp
Content-Length:   256

v=0
o=- 3461503025 3461503026 IN IP4 95.35.241.89
s=pjmedia
c=IN IP4 95.35.241.89
t=0 0
a=X-nat:5
m=audio 4000 RTP/AVP 102 101
a=rtcp:4001 IN IP4 95.35.241.89
a=rtpmap:102 speex/8000
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

--end msg--
--start msg (RX)--
NOTIFY sip:1002 at 95.35.241.89:5060 SIP/2.0
Via: SIP/2.0/UDP 67.23.5.142;rport;branch=z9hG4bKeaUNXcc7cXKmQ
Max-Forwards: 70
From: <sip:1002 at cheerfulsanity.net>;tag=S7D7Q4BB4ggep
To: <sip:1002 at cheerfulsanity.net>
Call-ID: d74d73dc-17ad-122d-de9e-40402384297d
CSeq: 120120735 NOTIFY
Contact: <sip:mod_sofia at 67.23.5.142:5060>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Event: message-summary
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Subscription-State: terminated;timeout
Content-Type: application/simple-message-summary
Content-Length: 97

Messages-Waiting: yes
Message-Account: sip:1002 at cheerfulsanity.net
Voice-Message: 3/0 (0/0)

--end msg--
--start msg (TX)--
SIP/2.0 200 OK
Via: SIP/2.0/UDP 67.23.5.142;rport=5060;received=67.23.5.142;branch=z9hG4bKgvD702De7e0Se
Call-ID: e56c2918-17ad-122d-de9e-40402384297d
From: "Extension 1001" <sip:1001 at 67.23.5.142>;tag=2rH67Q3aa1rpe
To: <sip:1002 at 95.35.241.89>;tag=e4f9fb648edef1c48dbc8b8b474409e6
CSeq: 120120747 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Contact: <sip:95.35.241.89:5060>
Supported: replaces, 100rel, timer, norefersub
Content-Type: application/sdp
Content-Length:   256

v=0
o=- 3461503025 3461503026 IN IP4 95.35.241.89
s=pjmedia
c=IN IP4 95.35.241.89
t=0 0
a=X-nat:5
m=audio 4000 RTP/AVP 102 101
a=rtcp:4001 IN IP4 95.35.241.89
a=rtpmap:102 speex/8000
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

--end msg--
-------------- next part --------------
--start msg (TX)--
INVITE sip:1002 at cheerfulsanity.net SIP/2.0
Via: SIP/2.0/UDP 192.118.11.112:64680;rport;branch=z9hG4bKPj3caad40720064a8f124c21cf99b8b1c1
Max-Forwards: 70
From: sip:1001 at cheerfulsanity.net;tag=6d6ef114e663e48226f2b1e598313a2e
To: sip:1002 at cheerfulsanity.net
Contact: <sip:1001 at 192.118.11.112:64680>
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23264 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Supported: replaces, 100rel, timer, norefersub
Session-Expires: 1800
Min-SE: 90
Content-Type: application/sdp
Content-Length:   264

v=0
o=- 3461521040 3461521040 IN IP4 192.118.11.112
s=pjmedia
c=IN IP4 192.118.11.112
t=0 0
a=X-nat:8
m=audio 64976 RTP/AVP 102 101
a=rtcp:64980 IN IP4 192.118.11.112
a=rtpmap:102 speex/8000
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

--end msg--
--start msg (RX)--
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPj3caad40720064a8f124c21cf99b8b1c1
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23264 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Content-Length: 0

--end msg--
--start msg (RX)--
SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPj3caad40720064a8f124c21cf99b8b1c1
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>;tag=ymc30B0vNXZBg
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23264 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Proxy-Authenticate: Digest realm="cheerfulsanity.net", nonce="0d21b0de-9d0b-11de-afe2-9bb840543c49", algorithm=MD5, qop="auth"
Content-Length: 0

--end msg--
--start msg (TX)--
ACK sip:1002 at cheerfulsanity.net SIP/2.0
Via: SIP/2.0/UDP 192.118.11.112:64680;rport;branch=z9hG4bKPj3caad40720064a8f124c21cf99b8b1c1
Max-Forwards: 70
From: sip:1001 at cheerfulsanity.net;tag=6d6ef114e663e48226f2b1e598313a2e
To: sip:1002 at cheerfulsanity.net;tag=ymc30B0vNXZBg
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23264 ACK
Content-Length:  0

--end msg--
--start msg (TX)--
INVITE sip:1002 at cheerfulsanity.net SIP/2.0
Via: SIP/2.0/UDP 192.118.11.112:64680;rport;branch=z9hG4bKPje8deea3c8476457603fe0cc301731002
Max-Forwards: 70
From: sip:1001 at cheerfulsanity.net;tag=6d6ef114e663e48226f2b1e598313a2e
To: sip:1002 at cheerfulsanity.net
Contact: <sip:1001 at 192.118.11.112:64680>
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
Supported: replaces, 100rel, timer, norefersub
Session-Expires: 1800
Min-SE: 90
Proxy-Authorization: Digest username="1001", realm="cheerfulsanity.net", nonce="0d21b0de-9d0b-11de-afe2-9bb840543c49", uri="sip:1002 at cheerfulsanity.net", response="5eab15df8541648b8890866f976a23e1", algorithm=MD5, cnonce="03d7b5789aacc7b832d4d618ca295ba2", qop=auth, nc=00000001
Content-Type: application/sdp
Content-Length:   264

v=0
o=- 3461521040 3461521040 IN IP4 192.118.11.112
s=pjmedia
c=IN IP4 192.118.11.112
t=0 0
a=X-nat:8
m=audio 64976 RTP/AVP 102 101
a=rtcp:64980 IN IP4 192.118.11.112
a=rtpmap:102 speex/8000
a=sendrecv
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15

--end msg--
--start msg (RX)--
SIP/2.0 100 Trying
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPje8deea3c8476457603fe0cc301731002
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 INVITE
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Content-Length: 0

--end msg--
--start msg (RX)--
NOTIFY sip:1001 at 10.171.9.67:5060 SIP/2.0
Via: SIP/2.0/UDP 67.23.5.142;rport;branch=z9hG4bKFKmeZ7vaa696j
Max-Forwards: 70
From: <sip:1001 at cheerfulsanity.net>;tag=XBKaZgFSrm9rm
To: <sip:1001 at cheerfulsanity.net>
Call-ID: e07248c2-17ad-122d-de9e-40402384297d
CSeq: 120120743 NOTIFY
Contact: <sip:mod_sofia at 67.23.5.142:5060>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Event: message-summary
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Subscription-State: terminated;timeout
Content-Type: application/simple-message-summary
Content-Length: 70

Messages-Waiting: no
Message-Account: sip:1001 at cheerfulsanity.net

--end msg--
--start msg (RX)--
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPje8deea3c8476457603fe0cc301731002
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 INVITE
Contact: <sip:mod_sofia at 67.23.5.142:5060;transport=udp>
RSeq: 669378962
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Require: 100rel
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 268

v=0
o=FreeSWITCH 4446028933093139022 3405868075899860026 IN IP4 67.23.5.142
s=FreeSWITCH
c=IN IP4 67.23.5.142
t=0 0
m=audio 26664 RTP/AVP 102 101
a=rtpmap:102 speex/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20

--end msg--
--start msg (TX)--
PRACK sip:mod_sofia at 67.23.5.142:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 192.118.11.112:64680;rport;branch=z9hG4bKPj3163ba6def02fe4c795703c1d1bef593
Max-Forwards: 70
From: sip:1001 at cheerfulsanity.net;tag=6d6ef114e663e48226f2b1e598313a2e
To: sip:1002 at cheerfulsanity.net;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23266 PRACK
RAck: 669378962 23265 INVITE
Content-Length:  0

--end msg--
--start msg (RX)--
SIP/2.0 183 Session Progress
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPje8deea3c8476457603fe0cc301731002
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 INVITE
Contact: <sip:mod_sofia at 67.23.5.142:5060;transport=udp>
RSeq: 669378962
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Require: 100rel
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 268

v=0
o=FreeSWITCH 4446028933093139022 3405868075899860026 IN IP4 67.23.5.142
s=FreeSWITCH
c=IN IP4 67.23.5.142
t=0 0
m=audio 26664 RTP/AVP 102 101
a=rtpmap:102 speex/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20

--end msg--
--start msg (RX)--
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPj3163ba6def02fe4c795703c1d1bef593
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23266 PRACK
Contact: <sip:mod_sofia at 67.23.5.142:5060;transport=udp>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Accept: application/sdp
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Content-Length: 0

--end msg--
--start msg (RX)--
NOTIFY sip:1001 at 10.171.9.67:5060 SIP/2.0
Via: SIP/2.0/UDP 67.23.5.142;rport;branch=z9hG4bKFKmeZ7vaa696j
Max-Forwards: 70
From: <sip:1001 at cheerfulsanity.net>;tag=XBKaZgFSrm9rm
To: <sip:1001 at cheerfulsanity.net>
Call-ID: e07248c2-17ad-122d-de9e-40402384297d
CSeq: 120120743 NOTIFY
Contact: <sip:mod_sofia at 67.23.5.142:5060>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Supported: timer, precondition, path, replaces
Event: message-summary
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Subscription-State: terminated;timeout
Content-Type: application/simple-message-summary
Content-Length: 70

Messages-Waiting: no
Message-Account: sip:1001 at cheerfulsanity.net

--end msg--
--start msg (RX)--
SIP/2.0 200 OK
Via: SIP/2.0/UDP 10.171.9.67:5060;rport=64680;branch=z9hG4bKPje8deea3c8476457603fe0cc301731002
From: <sip:1001 at cheerfulsanity.net>;tag=6d6ef114e663e48226f2b1e598313a2e
To: <sip:1002 at cheerfulsanity.net>;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 INVITE
Contact: <sip:mod_sofia at 67.23.5.142:5060;transport=udp>
User-Agent: FreeSWITCH-mod_sofia/1.0.3-exported
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, PRACK, MESSAGE, SUBSCRIBE, NOTIFY, REFER, UPDATE, REGISTER, INFO, PUBLISH
Require: timer
Supported: timer, precondition, path, replaces
Allow-Events: talk, presence, dialog, call-info, sla, include-session-description, presence.winfo, message-summary, refer
Session-Expires: 1800;refresher=uac
Min-SE: 120
Content-Type: application/sdp
Content-Disposition: session
Content-Length: 268

v=0
o=FreeSWITCH 4446028933093139022 3405868075899860026 IN IP4 67.23.5.142
s=FreeSWITCH
c=IN IP4 67.23.5.142
t=0 0
m=audio 26664 RTP/AVP 102 101
a=rtpmap:102 speex/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=silenceSupp:off - - - -
a=ptime:20

--end msg--
--start msg (TX)--
ACK sip:mod_sofia at 67.23.5.142:5060;transport=udp SIP/2.0
Via: SIP/2.0/UDP 192.118.11.112:64680;rport;branch=z9hG4bKPj949393fcf5e36fe32bb24b420101cd20
Max-Forwards: 70
From: sip:1001 at cheerfulsanity.net;tag=6d6ef114e663e48226f2b1e598313a2e
To: sip:1002 at cheerfulsanity.net;tag=06ym4113FFcHQ
Call-ID: 1473e9e828658e3fb0370fabf2ce8986
CSeq: 23265 ACK
Content-Length:  0

--end msg--

----------------------------------------------
Start receiving RTP packets with PT=98 instead of 102