[cisco-voip] SRST -- Am I missing anything

[Erick Bergquist]

Yea, you can add as many dial peers as needed. If it
is simple MGCP gateway and H323 for fallback put
'application mgcpapp' under all the the dial-peers
going to analog pots ports. Application mgcpapp isn't
needed on pots peers with PRI ports on them and theres
a cisco bug id on that saying thats not needed and
that can cause some odd MGCP failures now and then.

The reason I say to put application mgcpapp on the
peers if it is a simple config (all MGCP unless in
fallback) is I've seen people have dialpeers without
application mgcpapp and they weren't controlling what
peers inbound calls bound to, and one day out of blue
there inbound calls did not work. Inbound calls were
hitting a dial peer that didn't have mgcpapp on it and
it was trying to route call with H323 when all ports
and router was up in MGCP mode. 

As far as testing SRST fallback, with MGCP you need to
have the ports unregister from CCM and fallback to
MGCP. This can be done with ACLs on upstream router or
a blackhole host route to null0 for the call manager
server IPs. Be careful if doing blackhole method to
null0 as some routing protocols may redistribute that
automatically causing voice to go down at other sites.
If you can sometime, the real way to test is to cut
this site off from CCM and simulate a real outage.


--- "Voll, Scott" <Scott.Voll at wesd.org> wrote:

> I have the global commands.
> 
> The dial-peers come with MGCP / voice-port.  Can I
> add Dial-peers for
> SRST?  Do I need to use certain numbers?
> 
> When I test SRST, Can I make an ACL to block a phone
> from CCM or do I
> also have to block the VGW?
> 
> I don't think I need much for translations etc. as
> all calls need to go
> through the receptionist.  Just need to dial out and
> have calls come in,
> in case the t1 goes down.
> 
> Thanks
> 
> Scott
> 
> -----Original Message-----
> From: Erick Bergquist [mailto:erickbe at yahoo.com] 
> Sent: Monday, August 15, 2005 4:45 PM
> To: Voll, Scott; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] SRST -- Am I missing
> anything
> 
> 
> Do you have following global, also you may want
> dial-peers with more destination patterns and maybe
> a
> explict 911/9911 dial peer.
> 
> How about handling inbound calls in fallback, got
> connection plar on the voice-port? Might need
> translation rules/profiles also depending on dial
> plan
> or call flow needed.
> 
> 
> Global commands:
> 
> ccm-manager fallback-mgcp
> 
> call application alternate default
> 
> --- "Voll, Scott" <Scott.Voll at wesd.org> wrote:
> 
> > I would like someone to give me a thumps up or
> down
> > on my SRST config.
> > Am I missing anything?  I have it done in CCM. 
> Made
> > the SRST appearance
> > and added it to the device pools.
> > 
> > 
> > This is CM 4.1.3sr1 with a 2801 running 12.3T code
> > and 4 fxo ports.
> > DHCP, MGCP, etc. work.  Have not tested SRST yet
> but
> > would like it to
> > work when I test it.
> > 
> > Thanks for the input.
> > 
> > Scott
> > 
> > PS.  I think I need to add the destination-pattern
> > and incoming commands
> > on the other three dial-peers.  Anything else?
> > !
> > !
> > !
> > dial-peer voice 999011 pots
> >  application mgcpapp
> >  destination-pattern 9T
> >  incoming called-number .
> >  port 0/1/1
> > !
> > dial-peer voice 999000 pots
> >  application mgcpapp
> >  port 0/0/0
> > !
> > dial-peer voice 999001 pots
> >  application mgcpapp
> >  port 0/0/1
> > !
> > dial-peer voice 999010 pots
> >  application mgcpapp
> >  port 0/1/0
> > !
> > !
> > call-manager-fallback
> >  max-conferences 4
> >  ip source-address 10.215.103.1 port 2000
> >  max-ephones 30
> >  max-dn 50
> >  transfer-pattern 12..
> >  default-destination 1200
> 
> 
> 
> 	
> 		
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