Dear Sirs,
I am a newbie and please forgive me if this post does not below in this list.
I have a question that I hope you might be able to clarify for me. Gateway A
sends an INVITE to Gateway B with SDP. When B sends back 183 Session Progress
with SDP, shouldn't A respond and use the information within the 183 SDP
instead of waiting for B's 200 OK SDP? The cdr shows the duration of the call
as 72 seconds and the billable second as 43. That is almost 29 seconds before
the call is picked up. Shouldn't the 183 SDP from B to A help shorten this
post dial delay?
Thank you very much for your time!
Regards,
Pong
192.168.1.209 (A) 10.1.26.125 (B) 192.168.1.61 (A's Media Gateway)
| | |
| | |
0.000 |INVITE SDP (g729 g711U)| |
|------------------------------------>| |
| | |
0.001 | 100 Trying | |
|<------------------------------------| |
| | |
5.562 |183 Session Progress SDP (g711U) |
|<------------------------------------| |
| | |
| | RTP (g711U) |
5.583 | |-------------------->|
| | |
| | RTP (g711U) |
5.678 | |<--------------------|
| | |
28.942 | 200 OK SDP (g711U) | |
|<------------------------------------| |
| | |
29.014 | ACK | |
|------------------------------------>| |
| | |
29.499 | | RTP (g711U) |
| |-------------------->|
71.225 | BYE | |
|------------------------------------>| |
| | |
71.226 | 200 OK | |
|<------------------------------------| |
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