[cisco-voip] SRST design Q

[Tired Banchini]

hi chaps,

I am still on the early stages of the learning curve for voip so pls bear
with me. In regards to setting up SRST, I have read many docs but I am still
a little unclear on some design aspects, I was hoping some experienced hands
can share some knowledge.

First basic question is, can SRST work when the local 'branch' router is
either a VOIP GW or a regular transit router?

If yes and the router is a transit router will bear bones SRST where PSTN is
also directly connected to SRST router, what is best/ norm practice in terms
of when users want to make calls to the PSTN when in fallback mode i.e. what
number are presented to PSTN and also how are inbound calls treated?

I am thinking about a scenario where you have a DDI ranges presented at
remote PSTN hub sites that covers the remote site running SRST. So from PSTN
perspective all numbers with lets say 1xxx would route via the hubs and the
SRST site is 12xx. In the scenario where WAN is down at remote, my
understanding of SRST is that the same DNs will register will the local SRST
router i.e. the 12xx... However, I am assuming the PSTN attached to the SRST
router is another provider with a different DDI, does this simply mean I
have to do some translations to use PSTN?

Also on the same sort of subject ! When integrating sites in a CUCM
clusters, trying to get some concrete reasons for not configuring the sites
with CME and running them as GWs to the cluster versus registering the sites
directly with one of the closest clusters; is there any scientific rules for
how far latency wise the cluster should be from end user phones ?

thnks in advance
TB
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