[cisco-voip] One-way voice on T1

[Patrick Aland]

TAC can walk you through doing a dsp PCM dump and they can run it
through a program that will dump the actual audio being sent/received
from the PBX.

You could also try injecting tone towards the PBX using some of the
"test port" commands, see
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/vvfax_c/voipt_c/vtstele/vts_dgtl.htm

On 5/4/05, Madziarczyk, Jonathan <JMad at cityofevanston.org> wrote:
> This is what I have set up:
> CCM4.1 -> MGCP 2621XM-T1 -> NEC2400 IMX-T1 -> NEC PBX -> NEC2400 IMX-T1
> -> PSTN.
> 
> Between the 2621XM and the directly connected NEC T1 lines 1-4 and 17-24
> work fine in both directions.  However lines 5-16 only work incoming (to
> the CCM).  Outgoing does not work at all, regardless of who initiates
> the call and whether the destination is the PBX or the PSTN.
> 
> I'm at a total loss, on the Cisco side we've replace everything but the
> chassis on the 2621XM, on the NEC side we've replace the T1 card and
> even tried a different slot in the chassis.
> 
> After some NEC diagnostics, they verified that they did see "hex
> traffic" (voice audio) and the IE display name come across on the good
> calls (1-4, 17-24) but only saw IE display name come across on the bad
> calls (no hex traffic).
> 
> I have verified that I am seeing RTP in both directions over the IP
> network on both good calls and bad calls.  I even recompiled it in
> Ethereal as a wav file and heard the audio in both directions.
> 
> Is there any way I can verify that the 2621 is actually sending voice
> traffic across the bad lines?
> 
> Any other input would be EXTREMELY APPRECIATED.
> 
> Thx.
> Jon
> 
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-- 
--Patrick