Nortel Networks NN43001-504 Troubleshooting, Diagnosis flows, Call or signalling-related issues

196Appendix B Troubleshooting WLAN IP Telephony installations

•EAP or MAC Reauthentication interval

•TKIP MIC Failure Holdoff Time

Troubleshooting

Ensure that the WLAN IP Telephony and PBX product mix lines up with the compatibility matrix in the current Product Bulletin.

If the site does not conform, it is not classified as a supported installation.

Diagnosis flows

The following sections provide information about the troubleshooting process for different types of issues.

Call or signalling-related issues

Signaling issues are not normally a result of an issue with the IP data network. However, if an IP data network is congested or configured incorrectly, signaling traffic can be affected. Because call signaling is normally a combination of H.323 (TCP)- and Reliable User Datagram Protocol (RUDP) (IP Sets)-based traffic, the packets usually reach the destination, barring any IP network configuration issues. However, these packets could drop and cause excessive retransmission and delay. As an example, the IP phones keep-alive communication with the signaling server can be affected.

Table 24

Typical call-related issues

Issue	Type of	Check for
	issue
Unable to place	Network	IP phone:
a call		IP connectivity to Signaling server
		IP connectivity issues to other IP sets
		Excessive congestion or retransmissions
		Analog or digital phone:
		IP trunk connectivity issues
	Product	IP, analog, or digital phone:
		Phone configuration
		Dial plan
IP phone	Network	IP connectivity to Signaling server
resetting		Network congestion
	Product	Incorrect phone configuration
Call disconnects	Network	Intermittent network congestion that affects
or drops during a		the keep-alive
conversation
	Product	Signaling issues
		Incorrect configuration

Nortel Communication Server 1000

WLAN IP Telephony Installation and Commissioning

NN43001-504 01.02 Standard

Release 5.0 15 June 2007

Copyright © 2004-2007, Nortel Networks