[cisco-voip] H.323 Gateway Failover Testing

Thu Jan 12 21:04:54 EST 2006

what if you set up another set of dial peers on GW1 with a preference 
of 2 that points to GW2? This way, if the T1 on GW1 is down, calls 
should still go out over GW2's T1. You can leave the route group alone 
in CCM, so that if GW1 ever completely goes down, the CM will bypass 
it and route to GW2. 

Hope this helps!

----- Original Message -----
From: Stu Packett <SPackett at fenwick.com>
Date: Thursday, January 12, 2006 5:56 pm
Subject: RE: [cisco-voip] H.323 Gateway Failover Testing

> I set the CCM H225 Timer to 2 seconds and the fast busy still came 
up.
> I believe Erick's response is accurate that the CallManagers don't 
> knowanything about the gateway's status other than the gateways's IP
> address.  Once I'm able to shut GW1, I'll let you know what the 
> outcomeis.  In the meantime, I'm open to other suggestions.  Thanks.
> 
> -----Original Message-----
> From: Louis R. Marascio [mailto:marascio at metreos.com] 
> Sent: Thursday, January 12, 2006 2:12 PM
> To: Stu Packett; erickbe at yahoo.com; cisco-voip at puck.nether.net
> Subject: RE: [cisco-voip] H.323 Gateway Failover Testing
> 
> You need to tweak the H.225 TCP Timer service parameter.  This 
> parametercontrols how long CallManager will wait for the H.225 TCP 
> connection to
> be established when setting up a call.  Default values for this 
> serviceparameter differ between CCM versions but I've found that 
> it is usually
> set to a value that is too long.  In essence, CCM is giving up on the
> call before the H.225 TCP Timer has elapsed, and thus it has not 
> had a
> chance to try the next member in the route group.
> 
> Lower the value of the H.225 TCP Timer service parameter and try it
> again.  I don't think there is any harm in making it 1-2 seconds.
> Perhaps Wes or someone else on the list with a deeper 
> understanding can
> correct me here.
> 
> Best regards,
> 
> Louis 
> 
> ---
> Louis R. Marascio
> Metreos Corporation
> t: +1 (512) 687 2005
> m: +1 (512) 964 4569
> e: marascio at metreos.com 
> 
> 
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Erick 
> BergquistSent: Thursday, January 12, 2006 3:56 PM
> To: Stu Packett; cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] H.323 Gateway Failover Testing
> 
> With a H.323 gateway, the call manager doesn't know what hardware,
> ports, controllers, etc are in the gateway. The call manager just 
> sendsmessages to the gateways IP address and it's up to the 
> gateway to handle
> the call. The dialpeer, etc config on gateway is how that is done. 
> 
> Are there multiple dial-peer matches for the digits sent by call 
> managerin the gateway and the call maybe went out another port, etc?
> 
> Erick
> 
> --- Stu Packett <SPackett at fenwick.com> wrote:
> 
> > CallManager 4.0(2a)sr2b
> > 2811 IOS 12.4(5)
> > 
> > I have 2 H.323 gateways.  Let's call them GW1 and GW2.  In 
> > CallManager, I setup a route group with GW1 and GW2 in the list
> > (GW1 is first
> > preference).  I then setup a route pattern to use this route 
> group.  
> > To do some failover testing, I telnetted into GW1 and shutdown 
> the 
> > 'controller T1 0/0/0'.  Incoming calls failed over just fine to 
> GW2.  
> > My problem is when I do an outgoing call, I get a fast busy.  
> Does GW1
> 
> > need to be completely shut down for this failover test to work?  
> I'm 
> > thinking it's because CallManager sees GW1's IP address is still 
> up 
> > (even though
> > T1 controller is down) and routes the call there.  I don't have 
> access
> > to GW1 because it's at a remote site to shut it down, but does 
> the 
> > route groups depend on IP address and not on the controller's 
> status?> 
> > Thanks in advance.
> >
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