Cisco Bug: CSCta26717 - IP Phones not registering with IOS firewall configured in the gateway
Feb 05, 2017
- Cisco IOS
Known Affected Releases
Symptoms: IP phones do not register when an IOS firewall is configured in the gateway. Conditions: The symptom is observed when using a gateway with an IOS firewall configured. After an upgrade, the IP phones connected to the gateway do not register with CallManager. This problem occurs with nested class maps and match access groups, such as: class-map type inspect match-any protocols *****some protocols applied as filters***** class-map type inspect match-all traffic match class-map protocols match access group The problem will only be seen if the protocols to be matched require pin-holes in the ACL. That means whenever there is deep packet inspection involved, the data traffic fails.
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