Failover from UCM to CME...

[gdiazjr03]

Hi all,

I am new to Cisco voice. Not sure if my question is too general.

Is it possible to have remote sites use CME for call processing but still use everything else at the central location for directory, voicemail, etc?

Forgive my ignorance. I am learning all the lingo and pieces. I know we have an environment using SCCP.

What is happening is that when the remote sites go down due to WAN issues the remote sites are not able to make any calls.

I am trying to find a solution that will allow the remote site to still make calls off their PRI using CME as failover. Not too concerned with voicemail, but at least outgoing calls.

Any direction offered is much appreciated.

Thanks!

[Adrian Saavedra · Accepted solution]

Hi,

Yes you can. That feature is called SRST-as-CME (Survivable Remote Site Telephony as CallManager Express).

Read more:

http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesrst.html

Hope it helps, please rate if it does.

Kind regards,

- Adrian.

[gdiazjr03]

Thanks for your response!!!!

I will review the document.

[Craig Dyer · Accepted solution]

     The answer is YES, but you asked several questions

     You can use CME as a fallback only so CUCM controls the phones until an outage this is described here:-

          http://www.cisco.com/en/US/docs/voice_ip_comm/cucme/admin/configuration/guide/cmesrst.html

     You could have CCME control the phones all the time and use CUCM for directory services and integrate the voicemail solution into both CUCM and CCME (depends on version of Unity)

     Or there is there is also SRST which is simpler to depoly then CCME fall back but has fewer features.

     http://www.cisco.com/en/US/docs/voice_ip_comm/cusrst/admin/srst/configuration/guide/srstsa.html

Hope this helps,

Craig

PLEASE RATE HELPFUL POSTS

[gdiazjr03]

Thanks Craig for the info.

I believe the simpler failover is what we are looking for.

We don't foresee prolonged outages.

I really appreciate your help!

[gdiazjr03]

Craig,

I'm having trouble finding the details on maintaining call processing on CCME, which is what we want so that active calls are not dropped.

I can only find call processing FAILING to CCME when losing connection to CUCM.

Is there an additonal doc you can provide?

Again, my familiarization with the terms may be hampering my search.

Thanks for your help!

[Craig Dyer]

Hi,

     If you want to preserve calls when you fall into SRST then the only method (I can think of) is to reconfigure your gateway to be H323 and turn off the keep alive on the gateway (this allow the call to be preserved when going into fallback) and on the CUCM which allows preservation when the wan link recovers. THIS IS NOT SUPPORTED and also not a good idea

     If you really have a site where you need this to work then I would reconfigure the remote site to be CME controlled then have a trunk between head office and remote site and dual integrate the voicemail.

     This is a lot of work and an admin overhead.

Craig