[asterisk-users] RTP Mixer

[Eric "ManxPower" Wieling]

As I understand it, if you are using MeetMe, or if there is any codec 
translation, or having to listen to DTMF (it should only have to decode 
the audio to listen to INBAND DTMF, I don't know if it does), or other 
sorts of things that requires Asterisk to listen to or manage audio the 
audio will be decoded into SLN format.

I believe for MeetMe all the audio channels are decoded into the SLN 
format then that audio in SLN format is handed to the Zaptel driver to 
use some sort of voodoo magic to mix the audio.

Asterisk does not touch the actual audio except for after it has been 
converted to SLN format.

Akashdeep Dutta wrote:
> How does it really mix the packets. If i have three participants talking together and
> packets are reaching Asterisk, How does it mix them.
> 
> 
> Asterisk isn't an RTP mixer in the sense you are thinking of. Asterisk 
> mixes/exchanges audio frames in a protocol independent fashion. The 
> mixed frame then gets sent into the RTP core where it gets turned into 
> an RTP packet that is sent out.
> 
> Joshua Colp
> Software Developer
> Digium, Inc.
> On Mon, 7 May 2007 21:10:12 +0630, Akashdeep Dutta wrote
>> Does Asterisk really follow 3550 for CSRC. I am confused.
>>
>> On Mon, 7 May 2007 20:19:24 +0630, Akashdeep Dutta wrote
>>> Hi
>>>
>>> Does asterisk uses CSRC. I was trying to create a situation with 4 
>>> simultaneous users talking and executed ethereal to capture logs, studies RTP 
>>> but never found CSRC count to be more than 0.
>>>
>>> Can somebody explain me.
>>>
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> 
> 
> 
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