[cisco-voip] SRST Prefix

[Erick B.]

With MGCP,  CCM would be in control of call while in
MGCP mode and if SRST is configured then calls would
fallback to H323 *IF* the router is properly
configured when connectivity to CCM is lost. This
means the router has to lose it's MGCP establishment. 

With MGCP and SRST, if a handful of phones lose their
connection to CCM but router/gw doesn't those phones
will failover but the voice ports won't fallback so
won't be able to used by phones in fallback. 

There are 2 required commands for MGCP SRST fallback
to work.

ccm-manager fallback-mgcp  

call application alternate default

then, the pots dial-peers need 'application mgcpapp'
on them. Do not put 'application mgcpapp' under the
pots peer for a PRI port. We've been told by cisco
recently that this isn't needed and causes MGCP
failures. It's  a bug in the documentation. I don't
have the bug id handy but can get it if you need it.

The connection plar would only be in effect in H323
mode, in MGCP the "Attendant DN" field on the CCM
gateway config page will be used.

--- Colin Lowe <colin.lowe at cogeco.ca> wrote:

> Ryan,
> 
> I can see how this will work where the gateway is a
> non-MGCP controlled
> gateway (i.e. H.323).  
> 
> However, if the gateway is an MGCP gateway, how do
> you redirect the call in
> SRST mode, while not affecting inbound calls during
> normal operation? If I'm
> reading my traces properly, application MGCPAPP
> seems to invoke and the call
> goes nowhere (I hear dead air).
> 
> Any help would be greatly appreciated...
> 
> Colin
> 
> 
> 
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On
> Behalf Of King, Jesse
> Sent: Friday, February 04, 2005 3:30 PM
> To: Ryan Ratliff
> Cc: cisco-voip at puck.nether.net
> Subject: RE: [cisco-voip] SRST Prefix
> 
> Exactly what I was looking for. Worked perfect.
> Thanks.
> 
> Jesse 
> 
> -----Original Message-----
> From: Ryan Ratliff [mailto:rratliff at cisco.com] 
> Sent: Friday, February 04, 2005 3:03 PM
> To: King, Jesse
> Cc: cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] SRST Prefix
> 
> For an FXO port you'll have to configure a
> connection plar <dn> under the
> voice-port for the FXO port.
> 
> Since there is no concept of a called number with
> FXO you have to redirect
> every call inbound on the port to a specific place.
> 
> -Ryan
> On Feb 4, 2005, at 2:36 PM, King, Jesse wrote:
> 
> Can someone point me in the right direction to point
> inbound calls with SRST
> on an FXO port to a specific extension?
>  
> Thanks.
>  
> Jesse
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