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VoIP problems 35
When no host names are assigned to network devices, you can create
names using the Address Book command on the Tools menu. The names
then appear in the capture files in place of the IP address so you can read
the trace files faster than reading IP addresses. Save this address book
under the Address Book command on the Database menu.
To debug problems related to timing, you can select a packet in the
Decode tab Summary Section; right-click and select Mark Current Frame.
Notice that the selected packet has a Relative Time of 0 seconds to
provide an easy way to determine the amount of time that passed since a
particular event. This is helpful to debug IP Phone reset problems.
VoIP problems
This section describes VoIP problems you may encounter.
VGMC IP addresses incorrectly configured
If the VGMC detects a duplicate IP address, the card may print one or
more of the following messages:
JAN 02 08:06:57 tNetTask: Info arp info overwritten for
c0a80195 by 00:60:38:01: a1:46
JAN 02 08:06:57 tNetTask: Info duplicate IP address
c0a80195 sent from Ethernet address 00:60:38:01:a1:b8
The same IP address for two devices can cause unexpected and random
behaviours on the IP Phones or the VGMC or Signaling Servers. You
must identify the device that is configured to use the displayed IP address,
locate the device specified by the MAC address, and resolve the duplicate
IP assignment.
VGMC receiving incorrect Bootp information
Problems can occur when VGMCs receive invalid information from a
BOOTP or a DHCP server. The result can be a corrupt leader card. The
workaround is to turn the BOOTP relay agent off at the router where the
ELAN segment is connected.
IP Phone goes offline
Two scenarios can cause the IP Phone to go offline. Each can be
identified by logged messages.
Watchdog reset
The TPS periodically sends a watchdog timer reset message to every
IP Phone (see “Watchdog reset” (page 35)). This message resets a
watchdog timer on the IP Phone and causes the IP Phone to send
an acknowledgement. If no response is received from the IP Phone,
the RUDP transport resends the message up to 10 times, waiting 400
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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