CUCM inbound calls failover

[vantonenko]

Hello,

I have a question about receiving incoming calls, when Publisher is down.

My provider gives me IP telephony with two SIP-trunks for outgoing call, and one SIP-trunk for incoming call (Routed to Publisher), therefore, when Publisher is down, we can't receive incoming calls. 

How can I provide inbound calls, when publisher is down (or on maintenance)? 

What devices is used for this purpose? We also have voice-enabled router, with CME, can I use it?

Thank you.

[Suresh Subramanian · Accepted solution]

you can use CUBE (SIP to SIP). with dial-peers & preference, you can direct the calls to different server in CUCM group

[vantonenko]

Thank you Suresh,

As i understand, i can use CME instead CUBE, cause it has SIP to SIP and dial-peer with preference functionality? If i right, why CUBE better than CME in that case?

[EmilTaghiyev]

U can use 2 dial-peers with monitor probe icmp-ping

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/dialpeer/configuration/15-mt/vd-15-mt-book/vd-pstn-fallback.html

No need for using CUBE

[vantonenko]

Thank you, Emil

Before I try this, i want to clarify that CME can route calls from SIP-trunk to SIP-trunk without "border element mode".

I never met this configuration, so i afraid about this.

Can you dispell my doubts?

[EmilTaghiyev]

Yes U can use it without CUBE

All that U need is uck9

U can check it so

Activate demo for uck9

Voice service voip

allow-connections sip to sip

then configure dial-peers and make call