It's not important whether the payload type number in both SDPs is the
same but whether it is the same in the SDP received from the remote
device and in the headers of the RTP packets you send to it. In the SDP
it sends, each device says "if you are going to send me RTP packets
using codec A, mark them with payload type X".
P.
Dne 28.10.2016 v 22:46 Andy Chen napsal(a):
Ok so I confirmed #2 is not the issue. The payload number on the 200
OK is the same as the INVITE from SIPP.
As for the SSRC, I did noticed two separate streams with their own
unique port having different SSRC values generated by SIPP.
On Fri, Oct 28, 2016 at 1:35 PM, Andy Chen <ac...@fuze.com
<mailto:ac...@fuze.com>> wrote:
Thanks Pavel for the detailed response.
I did do a tcpdump locally on the sipp device and I do see
bi-directional RTP packets being exchanged, which may narrow down
the issue to #2 or #3.
On Fri, Oct 28, 2016 at 1:13 PM, sindelka <sinde...@ttc.cz
<mailto:sinde...@ttc.cz>> wrote:
As the pcapplay doesn't care what codec is the payload of the
packets it
replays, I assume the issue is different.
Just a bunch of points I would look at:
- does the same happen with another codec, like PCMA?
- the G.722 packets in the pcap file you replay bear some
payload type
number. If the receiving side has assigned another payload
type number
to that codec in its SDP, I'm not sure whether SIPp respects
that and
modifies anything in the contents of the RTP portion of the
replayed
packets prior to sending them.
- there may be some misunderstanding regarding G.722, G.722.1 and
G.722.2 - they are different (mutually incompatible) codecs
and for the
latter two, no fixed payload type number has been registered.
- if you replay exactly the same pcap file for all conference
participants, the conference bridge may get confused by receiving
several streams from different source sockets with the same
SSRC, as
SIPp does not modify SSRC while replaying a pcap.
Use tcpdump or Wireshark/tshark to check whether and where
does SIPp
actually send the RTP and what the payload type number is.
Pavel
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Sr. Telephony Lead Engineer
415 516 5535 (M)
ac...@thinkingphones.com <mailto:ac...@thinkingphones.com>
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