Failover for SIP CUBE

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Steven Holl Mon, 09/27/2010 - 06:16
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Can you purchase separate SIP trunks for each CUBE?  Or at least have the provider accept registration on the second as a 'failover' trunk?  Because if you can, 15.1(2)T has mechanisms built into CUBE for box-to-box failover with HSRP.

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Hi Steven,

we have to SIP trunks from a vendor located on different sites (IP/VPN routers) and there is no possibillity to use a Layer 2 routing between the sites so the Lan addresses are not the same so HSRP can't be used. The question is: Can Call Manager, CUCM, handle the failover with one SIP trunk to each CUBE configured?

Steven Holl Mon, 09/27/2010 - 06:47
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I assume you are using CUBE in media flow-through mode  If so, if you aren't going to use HSRP, then you'll never get the calls to be preserved during an outage.  However, new calls could be sent to the backup CUBE simply by having the provider configured to send calls to the other CUBE IP when the first is down.  And on the CM side, you'd have another RG in the RL for the backup CUBE, so that outbound calls hunt to that guy when the first is unresponsive.

If you did flow-around mode, media wouldn't go through CUBE, so you could achieve call survivability on active calls if your provider disabled session refresh for the trunks.  Because CUBE is stateful, when the original CUBE goes down, call control goes away and session refresh wouldn't be able to be sent from the backup CUBE.  Even the box-to-box redundancy feature on CUBE with HSRP can't handle session refresh, though, since the failover isn't stateful (yet).


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