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New Member

srst to be used in local where CCM is

I know srst is used for remote site when lost wan or ccm. Could we use it for local where ccm is? My customer has only 1 site with 1 CCM. I am thinking to use the local gw as SRST router in the case CCM fails. Technically this should work as long as I setup the ccm to use this router as srst router. but is this supported by Cisco?

5 REPLIES

Re: srst to be used in local where CCM is

Yes that is definitely possible. I have done several installs like that. But remember if you have a lot of phones in your main site and your router is not big enough to handle that many phones, then some phones may be out of service. THis is definitely supported.

New Member

Re: srst to be used in local where CCM is

No problems with this configuration; however, to take this a step further, when in SRST mode if your router is not big enough, ALL phones will be out of service, not just the extra. You will have to configure Device Pools to specify which phones will have SRST and which will not.

Silver

Re: srst to be used in local where CCM is

Why do you say that? I was under the impression SRST registration is first come first served?

Obviously, it's better to plan the device pools accordingly, so that you don't pass the max config, but if there is just one over the limit (either config or hard) I just think it doesn't get registered.

Re: srst to be used in local where CCM is

Lelio is right. SRST Is first come first served basis. So if the max limit is reached, remaining phones just wont register. Thats all.

New Member

Re: srst to be used in local where CCM is

Fair enough, I won't refute it, I remember otherwise and cannot find any documentation to back my claim.

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