[Spce-user] One-way RTP: wrong signaling

Mon Apr 13 11:10:41 EDT 2015

Hi,

Kamailio-LB rewrites signaling in the wrong way (c=IN line) and we get 
one-way RTP :(

U 2015/04/13 17:49:07.378769 83.x.x.142:5060 -> 10.0.64.64:5060
SIP/2.0 200 OK'
Record-Route: 
<sip:127.0.0.1:5062;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;did=a3b.273;ice_caller=strip;ice_callee=strip;vsf=bWRoWFdrc29zTkN2Y1kzdHk0UmM->'
Record-Route: 
<sip:127.0.0.1;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;nat=yes;ngcplb=yes;socket=udp:83.x.x.142:5060>'
Record-Route: 
<sip:83.x.x.142;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;nat=yes;ngcplb=yes;socket=udp:83.x.x.142:5060>'
Via: SIP/2.0/UDP 10.0.64.64:5060;rport=5060;branch=z9hG4bK46e8921d91291'
From: 
<sip:12550 at 10.0.64.64>;tag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022'
To: <sip:79263789192 at 83.x.x.142>;tag=5B58A9FC-552BD75C00066A91-1145A700'
Call-ID: 3704db80-52b1d75c-31f3b-4040000a at 10.0.64.64'
CSeq: 101 INVITE'
Allow: INVITE, OPTIONS, BYE, CANCEL, ACK, PRACK, COMET, SUBSCRIBE, 
NOTIFY, UPDATE, REGISTER'
Supported: replaces'
Content-Type: application/sdp'
Content-Length: 341'
Contact: 
<sip:ngcp-lb at 83.x.x.142:5060;ngcpct=7369703a3132372e302e302e313a353038303b707278726f7574653d31>'
'
v=0'
o=CiscoSystemsSIP-GW-UserAgent 927 6868 IN IP4 172.16.250.28'
s=SIP Call'
c=IN IP4 172.16.250.28'
t=0 0'
m=audio 18616 RTP/AVP 18 4 8 0'
c=IN IP4 172.16.250.28'
a=rtpmap:18 G729/8000'
a=fmtp:18 annexb=yes'
a=rtpmap:4 G723/8000'
a=fmtp:4 bitrate=5.3;annexa=no'
a=rtpmap:8 PCMA/8000'
a=rtpmap:0 PCMU/8000'
a=sendrecv'
a=direction:active'

U 2015/04/13 17:49:07.383307 10.0.64.64:5060 -> 83.x.x.142:5060
ACK 
sip:ngcp-lb at 83.x.x.142:5060;ngcpct=7369703a3132372e302e302e313a353038303b707278726f7574653d31 
SIP/2.0'
Via: SIP/2.0/UDP 10.0.64.64:5060;branch=z9hG4bK46e8a661610f1'
From: 
<sip:12550 at 10.0.64.64>;tag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022'
To: <sip:79263789192 at 83.x.x.142>;tag=5B58A9FC-552BD75C00066A91-1145A700'
Date: Mon, 13 Apr 2015 14:49:00 GMT'
Call-ID: 3704db80-52b1d75c-31f3b-4040000a at 10.0.64.64'
Route: 
<sip:83.x.x.142;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;nat=yes;ngcplb=yes;socket=udp:83.x.x.142:5060>,<sip:127.0.0.1;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;nat=yes;ngcplb=yes;socket=udp:83.x.x.142:5060>,<sip:127.0.0.1:5062;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;did=a3b.273;ice_caller=strip;ice_callee=strip;vsf=bWRoWFdrc29zTkN2Y1kzdHk0UmM->'
Max-Forwards: 70'
CSeq: 101 ACK'
Allow-Events: presence, kpml'
Content-Type: application/sdp'
Content-Length: 200'
'
v=0'
o=CiscoSystemsCCM-SIP 696416 1 IN IP4 10.0.64.64'
s=SIP Call'
 >>>>c=IN IP4 10.228.8.167'
b=TIAS:8000'
b=AS:8'
t=0 0'
m=audio 27476 RTP/AVP 18'
a=rtpmap:18 G729/8000'
a=ptime:30'
a=fmtp:18 annexb=no'

U 2015/04/13 17:49:07.383896 127.0.0.1:5060 -> 127.0.0.1:5062
ACK sip:127.0.0.1:5080;prxroute=1 SIP/2.0'
Record-Route: 
<sip:127.0.0.1;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;ngcplb=yes;socket=udp:83.x.x.142:5060>'
Record-Route: 
<sip:83.x.x.142;r2=on;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;ngcplb=yes;socket=udp:83.x.x.142:5060>'
Via: SIP/2.0/UDP 
127.0.0.1;branch=z9hG4bKc0ab.4c4d48e8e23cd67ad5d32cb9bbb4967a.0'
Via: SIP/2.0/UDP 10.0.64.64:5060;rport=5060;branch=z9hG4bK46e8a661610f1'
From: 
<sip:12550 at 10.0.64.64>;tag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022'
To: <sip:79263789192 at 83.x.x.142>;tag=5B58A9FC-552BD75C00066A91-1145A700'
Date: Mon, 13 Apr 2015 14:49:00 GMT'
Call-ID: 3704db80-52b1d75c-31f3b-4040000a at 10.0.64.64'
Route: 
<sip:127.0.0.1:5062;lr=on;ftag=696416~27154efa-6325-45a2-9e47-67e5d9302ebc-251833022;did=a3b.273;ice_caller=strip;ice_callee=strip;vsf=bWRoWFdrc29zTkN2Y1kzdHk0UmM->'
Max-Forwards: 69'
CSeq: 101 ACK'
Allow-Events: presence, kpml'
Content-Type: application/sdp'
Content-Length: 218'
P-NGCP-Src-Ip: 10.0.64.64'
P-NGCP-Src-Port: 5060'
P-NGCP-Src-Proto: udp'
P-NGCP-Src-Af: 4'
P-Sock-Info: udp:83.x.x.142:5060'
'
v=0'
o=CiscoSystemsCCM-SIP 696416 1 IN IP4 10.0.64.64'
s=SIP Call'
 >>>>c=IN IP4 10.0.64.64'
b=TIAS:8000'
b=AS:8'
t=0 0'
m=audio 27476 RTP/AVP 18'
a=rtpmap:18 G729/8000'
a=ptime:30'
a=fmtp:18 annexb=no'
a=direction:active'

btw How we can force RTP proxing and define headers filters?

-- 
Serge S. Yuriev
Lead VoIP engineer