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International calls fail on an MGCP ISDN gateway

Core Issue

A plan type mismatch on the gateway results in dropped calls.


In order to fix the issue, make sure you send the correct plan type for National and International calls. To verify the call setup use the debug isdn q931 command.

Note: If you run debugs on the production router, it can degrade the performance of the router.

When you change the plan type to National, it fixes the problem.

Refer to these documents for more information:

Problem Type

Gateway or module

Call control software  (CallManager, CallManager Express, ICS7750, SRST, SS7 call agents)

Call Control


Call Connection

Call connection establishment

Dropped or disconnected calls

CallManager Features

Call routing

Call Topology and Direction

To international destination

Signaling Protocol


TDM Signaling Type


Voice Gateways

IOS gateways

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 06:15 PM
Updated by:
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