srst

[bullitrider]

can you still recieve incoming calls at a remote site if the WAN is still available?

 

[jneiberger]

Incoming calls from other VoIP sites or calls from the PSTN? If you're talking about calls from the PSTN, where do the incoming lines terminate?

 

[bullitrider]

PSTN - using PRIs

 

[jneiberger]

You're going to have to give us more details about the type of failure you're worried about. Are you talking about a situation where your CallManager site is unreachable but all of your other sites are still up?

 

[iptuser]

The best way forward is to terminate your lcoal PSTN on the SRST router. Set up the router as MCGP/H323 which provides local Dial-peers for outgoing and inbound calls in SRST mode. This way you can receive DDI calls as long as the DDI/exetensions are registered. Set up the Call Manager so that if the WAN goes down you re-route via the PSTN to the extension where the SRST is invoked. Remember to translate the extension to the full DDI and use the Dial -peers in H323 to route the call to the SRST extension


wayne

 

[MG2005]

I use the SRST router to terminate PSTN PRI's and/or some PSTN trunks (POTS) (i would get two SRST routers for hardware redundancy). This way you can dial out and still receive DID calls when the WAN is inaccessible.

I use the IP network to talk/dial 4-digits (or whatever your private dial plan is) throughout our organization. We use callmanager inter-cluster trunks to talk/dial between callmanager clusters on the ip network.

I Have the SRST router dual configured for MGCP (normal operation) and h.323 for fallback operation when the ip netwrok/WAN is inaccessible (dial peers for routing calls)

 

[bullitrider]

for my SRST site, i want to still recieve PSTN calls whether or not my WAN links are available. (sort like a stand alone CME) Have my PRI's direct connected to my gateways.

(SRST is new to me....)

 

[jneiberger]

You will still be able to receive calls from the PSTN at your remote sites with SRST at sites that have PSTN connections.

 

[bullitrider]

jneiberger

thanks man. I read the cisco doc and couldn't find any info regarding incoming calls during a normal operation. (only SRST mode)

Is hardware redundancy recommended?

 

[jneiberger]

It's kind of hard to have hardware redundancy for your incoming PSTN connections. After all, how do you have the same PSTN circuit connect to two different routers?

I think in a Cisco IPT environment, you're redundancy needs to be at the core. How big is your network? You should have one CM publisher and at least one subscriber at your main site. If you're concerned about redundancy then you should also have a subscriber at a separate site and an extra server that you can turn into a publisher if your main site goes away for an extended period of time.

Perhaps someday Cisco will allow multiple master databases and you won't have to deal with a cold backup for your publisher. I think that's one major failing for Cisco's product. You can work around it but there isn't a really good way to do it.