[cisco-voip] WAN failure in call manager

[Karen Cheng]

No if the WAN is down the call manager has no way of performing call setup
or disconnects for the branch phones. Hence the SRST functionality.
Basically phones need to be configured with SRST to allow them to know call
out. The hardware platform of the router determines how many phones are
supported in SRST mode. After a certain amount of time in which the local
router cannot contact the CM it triggers SRST mode and phones that have been
configured are allowed basically phone functionality such as outbound calls
via the PSTN.

Hope that makes sense.

Karen

On Fri, Dec 11, 2009 at 8:15 AM, anand <anand.eee at gmail.com> wrote:

> Hi,
>
> I have been breaking my head to understand the exact functions of SRST.
> During the WAN failure, SRST router takes PSTN path.My question is during
> this time will the call manager controls the call or Call Manager is
> completely out of operation(I mean it does not take any part in the call
> control on the PSTN path).
>
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>
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