Troubleshooting Chart, Problem Suggested Action

Cisco High-Density Analog Voice and Fax Network Module

Configuration Tasks

To troubleshoot specific areas of the high density analog network module, perform the following steps:

•To show messages from the DSP on the VPM to the router, Use the debug vpm dsp .

•To show which debug commands are enabled, use the show debug.

•To enable the display of trunk conditioning supervisory component trace information, use the debug vtsp all.

Troubleshooting Chart

Table 4 lists some problems you might encounter after configuring voice ports and some suggested remedies.

Table 4 Troubleshooting Voice Port Configurations

Problem	Suggested Action

No connectivity	Ping the associated IP address to confirm connectivity. If you
	cannot successfully ping your destination, refer to the Cisco IOS
	IP Configuration Guide, Release 12.2.

No connectivity	Enter the show voice port command with the voice port number
	that you are troubleshooting, which will tell you:
	• If the voice port is up. If it is not, use the no shutdown
	command to make it active.
	• What parameter values have been set for the voice port,
	including default values (these do not appear in the output for
	the show running-config command). If these values do not
	match those of the telephony connection you are making,
	reconfigure the voice port.

Telephony device buzzes or does	Use the show voice port command to confirm that ring frequency
not ring	is configured correctly. It must match the connected telephony
	equipment and may be country-dependent.

Distorted speech	Use the show voice port command to confirm that the cptone
	keyword setting (also called region tone) is US.

Music on hold is not heard	Reduce the music-thresholdlevel.

Background noise is not heard	Enable the comfort-noisecommand.

Long pauses occur in	Overall delay is probably excessive; the standard for adequate
conversation; like speaking on a	voice quality is 150 ms one-way transit delay. Measure delay by
walkie-talkie	using ping tests at various times of the day with different network
	traffic loads. If delay must be reduced, areas to examine include
	propagation delay of signals between the sending and receiving
	endpoints, voice encoding delay, and the voice packetization time
	for various VoIP codecs.

Cisco IOS Release 12.2(2)XT and 12.2(8)T

Troubleshooting Chart

Problem

Suggested Action

IP Configuration Guide, Release 12.2.

the show running-config command). If these values do not

match those of the telephony connection you are making,

reconfigure the voice port.

Use the show voice port command to confirm that the cptone

keyword setting (also called region tone) is US.