6 Feb
2007
6 Feb
'07
12:17 p.m.
Hi Sam,
* Sam Lee <sam.lee(a)super.net.sg> [070206 11:09]:
Hey Guys,
Is it mandatory for SIP servers to generate to UA 180 Ringing to inform
them that the called party is now ringing ?
No
The reason i'm asking is because I am seeing strange results using
different UAs.
Using SIP clients to call out , instead of seeing 180 Ringing , i see
183 session progress even before call was picked up.
This is nothing wrong with this :)
On some sip client , ring back can be heard.
good, they support early media
On some others , ring back cannot be heard.
Bad,, they do not support Early media
Is there any reason to suspect that these UAs needs to receive 180
Ringing before generating any ringback ?
In general:
180 == Generate Local Ringback.
183 == get RTP from callee, and play it (often used for network
announcements, calls to gSM and simular)
- Atle
Regards,
Sam
_______________________________________________
Users mailing list
Users(a)openser.org
http://openser.org/cgi-bin/mailman/listinfo/users