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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)

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>
<error code="28">Received request from Untrusted IP = x:x:x:x:x:x:x:x</error>

- 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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