I have no idea about the cisco phones. Look at the stats of the sip phones and try to enforce ulaw / alaw as codec.
I use the same combination with a regular euro-isdn line, siemens isdn phones and nokia (e61) and snom sip phones. Perfect quality, the other end doesn't recognize the snom360 as an ip phone.
regards
Oliver
-----Ursprüngliche Nachricht-----
Von: Michael Landin Hostbaek <[EMAIL PROTECTED]>
Gesendet: 13.10.'07, 15:37
> Hello,
>
> I have a FreeBSD box (6.2) running Asterisk 1.4 (latest from ports) -
> in it, I have a Digium B410P QuadBRI card. On the card, I have (at
> this time) one ISDN2 (T0) plugged in.
>
> I have installed i4b (from trunk) with matching capi_chan.
>
> On the other side of my Asterisk box I have a simple LAN with n SIP
> peers (typically Cisco 7940/7960 phones)
>
> All SIP peers can ring back and forth without any problems, and they
> can of course, also ring to and from the Asterisk box (echo test,
> Voicemail etc etc)
>
> Now, when I receive a call one ISDN line - I have setup the following
> dialplan:
>
> [isdn-in]
> exten => _4215,1,Goto(some_context,2000,1)
>
> The SIP peer (2000) rings as expected, but the incoming sound quality
> it horrible, and there are huge delays. However, the outgoing RTP
> traffic is perfect.
>
> I am ONLY having this problem with the Cisco phones.. when putting
> fx. X-Lite or a Siemens phone - everything works fine.
>
> I have tried with different Cisco phones, and different firmware
> versions - but the problem persists.
>
> It is the exact same problem when dialing out thru the ISDN lines.
>
> The only thing I can see on the Cisco phones (stats) is that the
> "RxDisc" counter goes ballistic when it is connected.
>
> Any ideas or suggestions would be much appreciated!!
>
> /mich
>
>
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