Register a Cisco 2851 as a voice gateway on Nortel NRS H323 GK

Unanswered Question
Sep 30th, 2010

We have a Cisco 2851 registering as an h323 gatway with a pri connected to a Nortel option 11 using qsig.

The router is registered to a Nortel linux based NRS at release 5.5.

The other side of the connection is a Nortel CS1000E on 5.5 code.

Router is successfully registered and calls can complete correctly. However, if the call is placed on hold an then taken off of hold there is no audio path.

Any suggestions?

I have this problem too.
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Steven Holl Fri, 10/01/2010 - 07:40

How does Nortel do hold/resume for media streams?  Are they doing an empty capability set?  If so, you need:

voice service voip

h323

  emptycapability

Also, this shouldn't fix this, but find out if Nortel supports h450.2 and h450.3.  If Nortel doesn't support these, then you should disable them on the router:

voice service voip

no supp h450.2

no supp h450.3

Steven Holl Fri, 10/01/2010 - 07:41

If you still see issues after this, get:

debug voip ccapi inout

debug cch323 all

debug h225 asn1

debug h245 asn1

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