[Asterisk-Users] SIP Delayed Answer

[Michael Welter]

I have an Asterisk system connected with a CLEC that provides SIP 
termination.  When placing calls from phones on the Astersik system to 
the PSTN, the calling party hears ringing while the called party is 
saying "hello".

The problem appears to happen when calling a POTS line.  The problem 
does not seem to occur when calling a PSTN number on a T1 circuit, nor 
does it occur on inter-office calls.

When I listen to the "Monitor" recordings, I hear ringing and then the 
called party saying "hello? hello? hello?" while the calling party hears 
ringing.  Is the ringing that the calling party hears generated by 
Asterisk and not the ringing in the received audio stream?

Would this problem occur if the 200 (OK) message were delayed for any 
reason?  Does Asterisk wait for the 200 message before it connects the 
received RTP stream with the calling party?

Thanks,


Asterisk v1.2.4
Polycom IP501 phones
Private network between the Asterisk system and the CLEC.


-- 
Michael Welter
Telecom Matters Corp.
Denver, Colorado US
+1.303.414.4980
mike at TelecomMatters.net
www.TelecomMatters.net