[asterisk-users] Re: Codec swap (reinvite)

[Martin Joseph]

On 2006-10-14 20:00:30 -0700, "Julian J. M." <julianjm at gmail.com> said:

> Hi,
> 
> I've finally given up on trying to fax over my Digium TDM400 card.
> I've found that fax over VoIP is quite more reliable (at least I can
> receive the faxes).
> 
> My ITSP supports G729 and alaw/ulaw. As I won't be receiving faxes
> everyday (just ocasionally), i pretend on using g729, unless a fax is
> detected.
> 
> Is there any way to force asterisk to make a reinvite, and swap the
> codec on the fly? Something like this would be great:
> 
> exten => fax,1,CodecChange(ulaw)
> exten => fax,2,rxfax(blablabla)
I think the answer is no.  I am pretty sure this has been discussed 
multiple times and there is currently no way to change the codec once 
the call is established.