[cisco-voip] Cisco 2600 VIC-2BRI - no sound

[Guan Yang]

>  as the voice actually travels like a RTP stream, definitely one will see
> no
> RTP packets if no voice travels between the
>  parties. Possible problem for this situation are:
>
> 1. codec mismatch
> 2. firewall (RTP is actually UDP, make sure on the XP you have closed all
> firewalls).
>
> Better on the XP run a protocol analyzer like Ethereal (www.ethereal.com)
> and you will see what is actually going on.
> Ethereal is fully capable of "reading" VoIP sessions like H.323, SIP and
> etc.

After I posted that message, I did run Ethereal on it. I'll try to look
closer when I get home tonight. There *are* RTP packets, but when I look
at the payloads, there doesn't seem to be data -- it seems to be all
repeated 0xCB and 0xCE (comfort noise?).

Guan