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Cisco UCM: keepalives for route list

In a route list you have route groups.  Let's say you have but one device in each of your two route groups.  What is UCM using determine whether or not the device is available to receive calls?  That is what would cause UCM to move to the next member of the route list?  Is it using ping as a keepalive?  Something else?  The gateways in this case are ISR that are reached via SIP.  They are SIP trunks found in Device/Trunk.
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José Méndez

There are no keepalive mechanisms in this case. When a call is placed throug the SIP trunk, cm sends the INVITE message and waits for the far end to reply with a 100 Trying message. After certain amount of miliseconds, cm regards the other device as dead.

CM doesn't submit to the ISR as to a Registrar. It works in a peer 2 peer relationship.
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You could try turning on SIP Options Ping in the SIP Profile of each trunk to speed up CUCM knowing that a certain ISR is not responding.
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ASKER

Some more detail - the ISR trunks to UCM on the inside and on the outside the ISR trunks via SIP to the PSTN Carrier.  for inbound calls I have failover worked out with automatic call re-routing to another site that we have.  But if that SIP trunk to the carrier goes down I don't know of a way to inform UCM to use another outbound ISR at another site.  Do you know a means to automate this gateway failover?

From a manual perspective I suppose I could shut the inside interface via console.  Or I could go into UCM and make the backup ISR (at other site reachable via WAN) primary in the route list.
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Timothy Estes
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Thank you - I have some good paths to follow now.

Best.