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Voice calls traversing a PIX Firewall get disconnected after five minutes

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Core Issue

The PIX h225 fixup routine is causing the Transmission Control Protocol (TCP) zero byte  keepalives between the voice gateway and the Cisco CallManager to fail.  Consequently, the voice call gets terminated exactly five minutes after the  call setup due to unacknowleged TCP keepalive packets.

Resolution

Upgrade to a PIX Firewall version that contains a fix for the problem in Cisco bug ID CSCdy13293.

Another workaround is to downgrade to PIX version 6.1.3 or earlier. You may also disable fixup protocol h323 and h225 if Network Address Translation (NAT) is not used.

Problem Type

Call connection  (Connection quality: One-way audio, no busy tone, dropped calls, etc.)

Call Connection

Dropped or disconnected calls

Frequency and Scope of Symptom

Occurs at regular intervals

When Problem Occurs

During conversation

Call Topology and Direction

IP network > IP network

Bug ID Number

CSCdy13293

Security Features

Firewall

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