Cisco IP Telephony Troubleshooting Guide for Cisco CallManager Release 3.0(1)

The disconnect cause values (origCause_value and destCause_value — depending on which side hung up the call), map to Q.931 disconnect cause codes (in decimal) that can be found at http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/dbook/disdn.htm. In the example above, cause 16 refers to a normal call clearing. If the call is going out a gateway to the PSTN, then the CDR can be used to determine which side is hanging up the call. Much of the same information can be obtained by enabling tracing on the Cisco CallManager. Use the trace tool only as a last resort or if the network is not yet in production.

Check Your Loads

As with any problem, check the phone and gateway loads and CCO (Cisco Connection Online at www.cisco.com) for the latest software loads, new patches, or release notes relating to the problem.

Cisco CallManager Feature Issues

Problems may occur with features that are used in conjunction with Cisco CallManager, such as Conference Bridge or Media Termination Point. Some feature problems can be caused by configuration errors or lack of resources. For example, users may not be able to conference calls if the specified number of Ad Hoc conference resources has been exceeded. The result would be a dropped call when the user attempted to initiate the conference feature. This could appear to be a Cisco CallManager feature issue, when in fact it is a problem with the number of available conference resources. The number of times a conference resource was required but not available is one of the counters logged in Microsoft Performance. The same behavior would occur if there are conference resources available, but the conferencing service had stopped.

Codec/Regions: Codec Mismatch

If a user gets a reorder tone when going off-hook, it could be the result of codec disagreement between regions. Verify that both call ends support at least one common codec (for example, G.711). If not, you will need to use transcoders.

A region specifies the range of supported codecs that can be used with each of the other regions. Every device belongs to a region.

Note: Codec negotiation with a Cisco IOS router is not supported.

For example, Region1<->Region2 = G.711, means that a call between a device in Region1 and a device in Region2 can use G.711 or any other supported codec that requires the same or less bandwidth as G.711 (any supported codecs within G.711, G.729, G.723, and so on).

Note: The following codecs are supported for each device:

Cisco IP Phone 7960 — G.711A-law/µ -law, G.729AnnexB

Cisco IP Phone SP12 series and VIP 30 — G.711A-law/µ -law, G.723.1

Cisco Access Gateway DE30 and DT-24+ — G.711A-law/µ -law, G.723.1

© 2000 Cisco Systems, Inc.

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Cisco Systems 30 VIP manual Cisco CallManager Feature Issues
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30 VIP specifications

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