[cisco-voip] SRST (in 2821 and 3825) vs. CMM vs. AWG and somesurvivability design Qs

[Netfortius]

On Wednesday 12 April 2006 20:16, Erick Bergquist wrote:
> You could have multiple routers for SRST-use if you have that many phones
> to go over the limit on one router, and in CCM divide the phones at the
> site into different device pools each with a different SRST reference. Then
> have dial-peers on those back to the main-voice/SRST router at site with
> PSTN connectivity.

This is what I was thinking of doing, with the dual router provisioning.

>
> But this all depends on the type of failure that occurs, how it impacts
> network, site, etc. How about if a site loses power and only some
> components are on UPS/gen power and not the whole network IPT-wise?
>
> If you have a bigger remote site with a large number of phones, or it is
> important for them to have full phone services, etc in a total link failure
> to HQ maybe you want to look at putting a subscriber locally perhaps, etc.
>
> Currently with the old PBX, how do the phones work if you lose total
> connectivity for old PBX system back to HQ? Do you have a local PBX on site
> for the phones that is linked to PBX in HQ?  (same concept as local
> subscriber).

I have one PBX/ea. remote, connected over channels on a T1 to the PBX in the 
HQ, and also provided with a 6-10 POTS lines, for when the T1 fails.

All in all - one of my questions related to the difference between the various 
solutions I was contemplating, as I have no experience with any - see $subj. 
I already know the 2821s are not enough for what I need, and I do not want to 
take the chance to leave phones purposely not covered (even though some types 
of failures could - in fact - impact groups of them - under the 
group-splitting per multiple SRTSs on multiple routers example).

Thanks again to all who replied,
Stefan