[Asterisk-Users] How to stop Asterisk from changing the SDP?

[steve at daviesfam.org]

On Thu, 16 Jun 2005, Stian Selnes wrote:

> Hi.
> 
> Tanks for your answer. So I understand you correct if you mean that
> there is no way to let asterisk leave the SDP untouched? I have tried
> SER, and I just wanted to look at the possibilities that Asterisk
> offered. A bit dissapointing that it doesn't satisfy my needs :-)
> 
> - Stian 


No - for a particular application you can probably get the SDP stuff going 
out of Asterisk similar enough to the incoming for what you need.  This 
will be by adjusting the codec allows and disallows.

But Asterisk's core does not think in terms of sdp descriptors and so 
forth.  An incoming SIP invite becomes an incoming call into the Asterisk 
core, which via the dialplan may become an outgoing call to some other sip 
peer.  There's no connection between the incoming sip channel and the 
outgoing one from the point of view of the SIP channel driver.

Now I can't say whether Asterisk can satisfy your needs, seeing you didn't 
say what the needs are beyond "don't touch the SDP".  If that is really 
what you need, Asterisk as it is can't satisfy them.  But perhaps if you 
write the actual problem you are trying to solve you'll find that Asterisk 
can meet that!

Steve