[cisco-voip] SRST design Q

[Chris Ward (chrward)]

Tired,

 

I don't mean to brush you off, but your questions seem to be around the
configuration of SRST. Rather than try and explain all the components,
please check out this doc and read the overview. This doc also covers
some of the configurations you are going to need to use.

 

http://www.cisco.com/en/US/docs/voice_ip_comm/cusrst/admin/srst/configur
ation/guide/srstsa.html

 

HTH

 

-Chris

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Tired Banchini
Sent: Tuesday, August 18, 2009 8:10 PM
To: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] SRST design Q

 

Guys,

 

Is this the right forum for this type of question ?

On Tue, Aug 18, 2009 at 12:37 AM, Tired Banchini
<tired.banchini at googlemail.com> wrote:

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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