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Cisco Bug: CSCta26717 - IP Phones not registering with IOS firewall configured in the gateway

Last Modified

Mar 04, 2018

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

Symptoms: IP phones do not register when an IOS firewall is configured in the
 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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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
  • Related Community Discussions
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