[cisco-voip] Silence with Nortel integration

[Andrius Kislas]

Check if you see voice packets going to/from DSP during the call to Nortel:
sh voice dsp acti

Of course you have to figure out which DSP is used for your test call.

Check on both sides if Cisco and Nortel are using the same voice channel.

There are some differences in how Cisco and Nortel counts voice channel
I think starting from 17th in case of different flavours of QSIG
configured on Nortel. So you might want to check that too. There are few
documents regarding this on cisco.com.

If nothing helps tells us what model of Nortel you have and show at
least what is configured on Cisco.

Andrius

On 2010.04.28 23:24, Bill wrote:
> All other H.323 calls to this gateway work fine. Only when going over
> the PRI that is connected to the Nortel. As much as I would like to
> point the finger there I need some very hard evidence to go that route.
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *From:* Jason Aarons (US) [mailto:jason.aarons at us.didata.com]
> *Sent:* Wednesday, April 28, 2010 3:21 PM
> *To:* Bill; 'cisco-voip voyp list'
> *Subject:* RE: [cisco-voip] Silence with Nortel integration
> 
>  
> 
> I'd get a sniffer up on 3845s Ethernet port and watch the H225/H245
> packets.  Got another H323 endpoint you could test with to narrow down
> it's a Nortel issue?
> 
> ------------------------------------------------------------------------
> 
> *From:* cisco-voip-bounces at puck.nether.net
> [cisco-voip-bounces at puck.nether.net] On Behalf Of Bill
> [bill at hitechconnection.net]
> *Sent:* Wednesday, April 28, 2010 4:08 PM
> *To:* 'cisco-voip voyp list'
> *Subject:* [cisco-voip] Silence with Nortel integration
> 
> I have a 3845 configured as an h.323 gateway. I have four PRI’s
> connected to this gateway from the PSTN. I also have a single PRI
> connected to this same gateway used as a tie line to a Nortel system. I
> have had no complaints on calls going or coming from the PSTN. I have
> had several complaints on calls to and from the Nortel box. The call
> could be setup fine and you are talking but the call basically goes
> silent for about 10 – 15 seconds. The call does not drop only silence.
> Also if you stay on the call the audio starts up again. I don’t think it
> is an IP routing issue because calls to the PSTN work correctly and
> calls do work to the Nortel it just will stop for a few seconds. There
> are no slips and no errors on the line.
> 
>  
> 
>  
> 
>  
> 
> ------------------------------------------------------------------------
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