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Cisco Bug: CSCvu23831 - EM login / logouts are failing with error code 28 when device is using IPv6

Last Modified

Sep 01, 2020

Products (1)

  • Cisco Unified Communications Manager (CallManager)

Known Affected Releases

12.0(1.10000.10) 12.5(1.10000.22)

Description (partial)

Symptom:
Extension Mobility login and logouts fail with error code "28" in when IP phone is in IPv6 only mode.  EM Service logs may show an error like this:

2020-04-24 13:17:20,958 INFO  [http-bio-8443-exec-19] EMServiceServlet          - 2:Request succeeded returning<response>
<failure>
<error code="28">Received request from Untrusted IP = x:x:x:x:x:x:x:x</error>
</failure>
</response>

Conditions:
- Phone is registered with IPv6 mode and IPv6 address notation differs for same end point
- Service parameter "Validate IP address" is set to "true".
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