[cisco-voip] One-way voice on T1

[Voll, Scott]

What signally protocol are you using between the router and PBX?  Qsig?

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Madziarczyk,
Jonathan
Sent: Wednesday, May 04, 2005 9:41 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] One-way voice on T1

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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