[cisco-voip] CCM Publisher and subscriber

[Kevin Thorngren]

Hi Nesen,

There are two approaches for providing IP Phone Services redundancy.  
The recommended approach is to use Server Load Balancing and point the 
service URLs to the virtual server IP of the server farm.  The second 
approach is to use DNS to map a "virtual" hostname (configured in the 
services URL) to multiple IP addresses which are the CCM servers.  The 
theory is that if the first server tried is down the phone will try the 
next IP Address.

Using DNS does have some caveats
1. The behavior of different phone models may vary
2. The timeout between retries may be quite high, I have seen people 
state 90 seconds

The DNS option is not considered robust solution as DNS is not aware of 
whether a server is active or not where SLB knows the state of the 
servers.

If you choose to try the DNS option please make sure to test thoroughly 
so you understand how it is going to work in your environment and with 
the types of phones you have.

HTH,
Kevin
On May 5, 2006, at 3:46 AM, Nesen Kisten wrote:

>  
> Hi Guys,
>  
> When my CCM publisher goes down, my subscriber does not take over 
> completely,
> i.e calls are affected, and services are unavailable, I am aware 
> though that under enterprise parameters the ip address is that of the 
> publisher therefore no ip phone services are available, and I cant 
> change it to IP address of subscriber since no updates can be done 
> when publisher is unavailable.
>  
> Is there a way around this ?, or is publisher subscriber config is not 
> correct.
>  
> Kind Regards
>  
> Nesen
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