[cisco-voip] H.323 Gateway Failover Testing

Thu Jan 12 23:45:15 EST 2006

I'd like to go with MGCP as well, but Cisco MobilityManager only runs on
H.323 gateways, so we can't make the switch yet.  Thanks.

-----Original Message-----
From: Ortiz, Carlos [mailto:CORTIZ at broward.org] 
Sent: Thursday, January 12, 2006 6:43 PM
To: Stu Packett; Louis R. Marascio; erickbe at yahoo.com;
cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] H.323 Gateway Failover Testing

This may not be the answer you want, but if you were to implement MGCP
gateways this may do it for you.  With MGCP Call Manager controls the
gateways and pulls this off nicely.  Almost all my gateways are MGCP and
I have seen it bypass unreachable PRI's seamlessly.

Carlos

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Stu Packett
Sent: Thursday, January 12, 2006 5:56 PM
To: Louis R. Marascio; erickbe at yahoo.com; cisco-voip at puck.nether.net
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 know
anything 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 outcome
is.  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 parameter
controls how long CallManager will wait for the H.225 TCP connection to
be established when setting up a call.  Default values for this service
parameter 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 Bergquist
Sent: 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 sends
messages 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 manager
in 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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