[SR-Users] mediaproxy-ng: error rewriting SDP during a video call

[Alexey Rybalko]

Hi!

Few days ago I was lucky to establish calls between Chrome and SIP UA.
Thanks to new rtpproxy developers! That was for audio only because many UAs
lack for VP8 support. To verify a video  I tried to involve Jitsi into the
tests. Mediaproxy can't rewrite answer SDP from Jitsi. Probably the issue
is related to SDP but I'm not sure to which part in particularly.

*Original offer SDP (ICE attributes are skipped) *

v=0
o=- 6784329718950523193 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video
a=msid-semantic: WMS 0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpP
m=audio 59996 RTP/SAVPF 111 103 104 0 8 107 106 105 13 126
c=IN IP4 10.xx.xx.xx
a=rtcp:59996 IN IP4 10.xx.xx.xx
....
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=sendrecv
a=mid:audio
a=rtcp-mux
a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:VZhAArr96fxUtzvuNPpE+OSa09wchsmTD9pdrdBv
a=rtpmap:111 opus/48000/2
a=fmtp:111 minptime=10
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:107 CN/48000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:126 telephone-event/8000
a=maxptime:60
a=ssrc:579751405 cname:n2gMzhLDYdqpWwP7
a=ssrc:579751405 msid:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpP
0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpPa0
a=ssrc:579751405 mslabel:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpP
a=ssrc:579751405 label:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpPa0
m=video 59996 RTP/SAVPF 100 116 117
c=IN IP4 10.xx.xx.xx
a=rtcp:59996 IN IP4 10.xx.xx.xx
...
a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
a=sendrecv
a=mid:video
a=rtcp-mux
a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:VZhAArr96fxUtzvuNPpE+OSa09wchsmTD9pdrdBv
a=rtpmap:100 VP8/90000
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 goog-remb
a=rtpmap:116 red/90000
a=rtpmap:117 ulpfec/90000
a=ssrc:1190198390 cname:n2gMzhLDYdqpWwP7
a=ssrc:1190198390 msid:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpP
0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpPv0
a=ssrc:1190198390 mslabel:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpP
a=ssrc:1190198390 label:0dKFIAlsVMexmIc0qjieYgfPDvBnSLG5lmpPv0

*Original answer SDP*

v=0
o=user2 0 0 IN IP4 10.xx.xx.xx
s=-
c=IN IP4 10.xx.xx.xx
t=0 0
m=audio 5052 RTP/AVP 0 8 126
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:126 telephone-event/8000
m=video 5054 RTP/AVP 100
a=rtpmap:100 VP8/90000

*Mediaproxy logs* (for answer SDP)

mediaproxy-ng[14907]: Got valid command from 127.0.0.1:38310: answer ....
mediaproxy-ng[14907]: [7dmpb0qdja07p87pa1ji - ] Got LOOKUP, but no usable
callstreams found
mediaproxy-ng[14907]: Error rewriting SDP
mediaproxy-ng[14907]: Protocol error in packet from 127.0.0.1:38310: Error
rewriting SDP:...

However the *audio calls work well*. Here's the answer SDP from Jitsi:

v=0
o=user2 0 0 IN IP4 10.xx.xx.xx
s=-
c=IN IP4 10.xx.xx.xx
t=0 0
m=audio 5048 RTP/AVP 0 8 126
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:126 telephone-event/8000

Comments and suggestions would be greatly appreciated.

regards,
Alexey
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20130801/f236d42c/attachment-0001.html>