Hi,
I am trying to use SIPp for multimedia files to test my platform. On UAC I use
PCAPPLAY and on the UAS side I want to use rtp-echo to echo back audio+video
ports. I am using SIPp for Windows (version 3.2) which I compiled myself and
integrated PCAPPLAY.
The problem I am seeing is this:
I define "auto_media_port" for m=audio port in SIPp SDP and "auto_media_port+4"
for m=video port in SIPp SDP (UAC side). I see SIP negotiation use these
ports, but when PCAPPLAY starts (playing a file with synchronized audio & video
RTP streams) it uses auto_media_port for audio stream and auto_media_port+2 for
video stream. So that is the first issue.
Then, on the UAS side, I also setup SIPp SDP to use +4 for video and that
negotiates fine. However, I see by the SIPp help comments that rtp-echo will
reflect the audio but video only if the port is audio+2. This is verified in
testing where audio is reflected back but not video.
So in the SIPp source code I would like to change the PCAPLAY and rtp-echo
hardcoded offsets from +2 to +4. Looking in the send_packets.c and
prepare_pcap.c files I do not see where the +2 offset is used now. These files
are only for UAS PCAPPLAY anyways. I also need to find the source for where
rtp-echo is handled.
I need this because my system (that sits between UAC and UAS) always uses a +4
offset for video RTP streams (and negotiates that in SIP, which SIPp is fine
with).
Also, I am not sure if the Windows source is any different than the Linux
version of SIPp in this area?
Thanks,
Greg Horton
Embedded Software Engineer
Dialogic Research Inc.
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