[Asterisk-Dev] echo, delay and dropped packets in channel driver

[Boris Bakchiev]

Perhaps the async patch will help you with this.
Its will use independent timing for in/out channels.
http://bugs.digium.com/view.php?id=5374


>Asterisk is just the "slave" of the incoming SIP frames.  So as it 
>receives them it sends them out to the outgoing channel.

>Now the sirrix is externally synced to the ISDN line so can only send
out 
>audio at the rate clocked by the line.

>So the excess samples accumulated in a buffer in the sirrix kernel
driver.
>Worse, when the buffer filled, the channel driver actually waited for
the 
>write - which then caused trouble for other things as the thread got 
>blocked.