Re: One-Way Audio

On Fri, Mar 16, 2012 at 11:59:38AM +0100, Ralf Schlatterbeck wrote:
> I'm observing one-way audio here with the following configuration:
> 
> - Asterisk 1.8.4.4 on ubuntu
> - Kernel 3.2.0-18 from ubuntu
> - mISDN, mISDNuser, LCR from yesterday (GIT mISDN.eu)
> - made sure to remove old mISDN from installed kernel in /lib/modules,
>   installed new modules and ran depmod, so I'm quite sure we're running
>   correct version
> - HFCmulti card (I can dig out the info which card if needed)
> 
> Both, call *from* a sip-phone into asterisk out via ISDN as well as an
> incoming call from isdn to sip phone experience one-way audio: The ISDN
> side can hear everything from the SIP phone but not vice-versa.
> 
> When we bridge two isdn calls via Asterisk, we get two-way audio, in
> that case both isdn users can hear each other. Seems in this case audio
> is bridged *in the ISDN card* am I right in this asumption?
> 
> An strace of asterisk with the one-way-audio setup shows us that
> asterisk is polling a file descriptor but never receiving anything while
> it copies lots of data in the other direction.

Maybe some of the buffer changes was ported to the HFC Multi driver in a
wrong way, also CAPI has issues, I still have this on my TODO list.

Karsten