23 dec 2009 kl. 06.17 skrev prasha...@digilink.in:

> 
> Hi, 
> 
> How asterisk distinguish whether the re-invite is for codec change or for a 
> session refresh? I know that it checks the session version and decides the 
> same. But even if session version is different from the initial invite and 
> but it has the same codec, asterisk identifies that it is a session refresh 
> and does not pass this INVITE to the other end. 
Asterisk NEVER passes any SIP message to the other end. Asterisk is a b2bua, 
not a proxy.

THe decision to send an re-INVITE on the second call leg is made separate from 
whatever happens with the SIP dialog on the first call leg.

/O
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