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44 Troubleshooting
The selected channel can belong to a card in a different node. If the
TLANs are separate and the IP network cannot route between the two
subnets, then the IP Phone cannot access the IP address associated with
the channel, which results in no speechpath.
If the IP network can route calls between the two subnets, then make sure
that you correctly configure the default gateway. If no routing capabilities
exist between the two subnets, you can solve the problem by adding a
new zone for each node on a separate TLAN, and then configuring the
channels and IP Phones to belong to the new zone.
Cannot make calls with particular zone and codec configurations
A problem can exist where a call connects but the codec does not match
your expectation based on the zone configuration. Or, a call can fail to
connect, and an error message prints on the Call Server TTY stating "No
codec match found". This error occurs if you do not download the card
configuration to all cards in the node after modification of the codec list.
Then, when an IP Phone registered on one VGMC/Signaling Server calls
an IP Phone registered on a different VGMC/Signaling Server or makes a
gateway call by using a channel from a different VGMC, a codec mismatch
can occur.
The codecs configured in EM are placed in the CONFIG.INI file (see
“CONFIG.INI” (page 400)) and downloaded to the VGMC. When the
VGMC gateway channels register with the Call Server, the configured
codec capabilities are sent to the Call Server CPU. Likewise, when an IP
Phone registers with the system, the list codecs reported by the telephone
as supported are sent to the Call Server. When a call occurs, the Call
Server decides which codec the call uses based on the zones of the two
endpoints:
If the call is within the same zone (that is, both have the same
zone value configured), the Intrazone codec is used; otherwise, the
Interzone codec is used.
If a mismatch occurs between the codecs (that is, one endpoint has BB
(for example, G.729AB) and the other BQ (for example, G.711)), the
Call Server chooses the codec with the lowest bandwidth usage (that
is, BB).
In the case of a gateway call, the zone of the VGMC gateway channel
is compared to the IP Phone zone.
A problem can occur when the codecs change and the change is not
downloaded to all cards in the node. This can result in the two endpoints
registering with different codec lists. If only one codec matches between
the two lists, the call may complete but use a codec different from the
Nortel Communication Server 1000
Troubleshooting Guide for Distributors
NN43001-730 02.02 31 December 2009
Copyright © 2008-2009 Nortel Networks. All Rights Reserved.
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