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Do phones automatically failover when a Subscriber is down?

We are running CUCM 8.6 with one publisher and two subscribers. One of the subscribers has failed and we are now running off only one subscriber. In this mode, we are experiencing a number of minor problems with the phones including:

  1. Time on handsets using incorrect format. (shows as 24hour when it should be 12 hour)
  2. Phones keep ringing after the extension has beenanswered.
  3. One-Way voice.
  4. Calls dropping out when put on hold
  5. Unable to pickup call when it's put on hold.

Are the phones meant to automatically failover to the other subscriber when one fails? Or do we need to manually reboot the handsets for this to take place?

Also, is all functionality meant to be available when running in the degraded mode?

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Cisco Employee

Hi Robert,The phones should

Hi Robert,

The phones should automatically failover to the backup subscriber if the backup subscriber is added in the Callmanager group which is assigned to the device pool of the IP phone. For issues like one way audio and dropped calls you also need to check that the media resources like Transcoder , CFB , MTP etc have backup servers defined, else you will experience issues where these resources are requested but they are unregistered as the only subscriber which is defined for them is down.