1 Aug
2005
1 Aug
'05
8:53 a.m.
Very hard to say without a complete ngrep trace. If both parties are on public IPs, there
is probably something with the signalling, not the SDP payload. The 183 Session Progress
is a so-called provisional reponse. It can be used for early media (to set up the rtp
stream before connection). A double 183 sounds strange if it's the proxy that does
it.
g-)
---- Original Message ----
From: Sam Lee
To: serusers(a)lists.iptel.org
Sent: Monday, July 25, 2005 12:27 PM
Subject: [Serusers] 1 way voice issue
Hi,
I've recently encountered some problem with my SIP service whereby i
call out to a specific number and i encounter a one way voice. If i'm
the initiator, i cannot hear the other party but he can hear me. At
first i thought it was a return route issue (as i'm going thru NAT) ,
so i switch my SIP to a public IP but i still face the same problem.
Its really only that specific PSTN number that i have dialed facing
this problem. The only difference that i can think of is that PSTN
number is on a different route. I did a NGREP from my SIP server for
the PSTN number that works (2-way voice) and the Number that doesn't
work (1-way voice) . The only difference is there is an extra :
NGW --> Proxy
SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP
Proxy --> SIP Device
SIP/2.0 183 Session Progress..Via: SIP/2.0/UDP
for the PSTN number that works (the one with 2-way voice).
Anyone has idea what does the Session Progress is for ? Or what
problem am i facing ?
Thanks a mILLION !
Regards,
Sam
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