[Asterisk-Dev] Codec Change during call

[Denis Marusic]

Hi everybody,
 
I'm looking for a solution to be able to change the codec during a
session in Asterisk. 
 
            UA <============> * <============> UA
                        ulaw                     ulaw
 
after codec change it should look like this for example:
 
            UA <============> * <============> UA
                        ulaw                     GSM
 
 
By using X-Lite it is possible to change the codec. But how to change
from Asterisk?
I'm able to change the payloadtype by changing the rtp header.
But I'm not able to change the payload itself. 
 
Can anybody tell me how to force asterisk to change the codec and
transcode the payload?
 
I didn't find any doc about transcoding. It seems to me nobody is
working on a possibility
To increase QoS by changing codec if bandwidth is to low.
 
Any hint will be helpful.
 
 
Best regards 
 
Denis Marusic
Denis at marusic-online.de
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