[asterisk-users] Preventing IAX frame concatenation

[David Hogan]

Hi all,

 

I have spent some time searching, but I haven't found a way to prevent *
from concatenating two frames into one IAX packet.

 

I have a situation where I make an IAX GSM call to *, which transcodes
to an iLBC SIP call. Every second voice packet the IAX client receives
contains 2x 20ms frames, the other containing only one. I presume this
is related to the mismatch of 20ms GSM vs 30ms iLBC. What is odd, is
that this doesn't happen when I use G711 on the IAX leg - each packet
contains 20ms.

 

Anyway, the IAX client I am using isn't handling the 40 ms packets
gracefully. Is there something I can configure on * to prevent the
concatenation?

 

Cheers,

David Hogan

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