[cisco-voip] Antwort: Re: phones at remote site frequent failing over to SRST, wan issue?

[Hans-Peter Walter]

I have no solution for your problem, but I ran into a similar 
issue where calls where dropped when switching between CCM and SRST.

I know you have MGCP, and we are running h.323, but after configuring

voice service voip 
 h323
 no h225 timeout keepalive 

we can now switch between CCM and SRST during calls with no interruptions 
at all. Maybe something similar for MGCP exists?

Good luck,
HP





"Justin Steinberg" <jsteinberg at gmail.com> 
Gesendet von: cisco-voip-bounces at puck.nether.net
27.02.2007 16:01

An
"Matt Slaga (US)" <Matt.Slaga at us.didata.com>
Kopie
cisco-voip at puck.nether.net
Thema
Re: [cisco-voip] phones at remote site frequent failing over to SRST, wan 
issue?






This brings up a question I have been meaning to ask. How do most people 
handle a bouncing WAN circuit with centralized CCM deployments?   If you 
have a remote site with a SRST router and that site's WAN link back to CCM 
is bouncing it seems like the phones will constantly register to CCM, 
register to SRST, register back to CCM, etc as the WAN link goes up and 
down. 

I tried to adjust the CCM Device Pool connection monitor as well as 
changing the 'switchback' setting on the SRST gateway.  But these settings 
do not seem to come into play for transitions between CCM and SRST.  I 
think they are only for transitions between a Primary CCM and Secondary 
CCM. 

How do you guys deal with a circuit that might be bouncing up and down 
constantly for some amount of time as Telco is fixing the circuit?

Is there a way to say, "Stay in SRST until the circuit has been up and 
working for 5 minutes". 

Thanks,
Justin

On 2/27/07, Matt Slaga (US) <Matt.Slaga at us.didata.com> wrote:
Are you running remote backups or something similar that is
oversubscribing the links at 1:00am?



-----Original Message-----
From: cisco-voip-bounces at puck.nether.net 
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of tony
Sent: Tuesday, February 27, 2007 1:08 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] phones at remote site frequent failing over to
SRST,wan issue?

Hi all,

We have a remote site in Australia connected back to our singapore
headquarters, which is home of our callmanager.  Phones in our australia 
site register back with the callmanager in Singapore.  If the WAN link
goes down, they would register with the voice gateway in SRST mode.
What we would see in our CM logs is that phones will unregister from the 
primary callmanager, try to register with the secondary, and then
attempt to register with srst.  We believe that this is primarily a
circuit issue, but a ticket opened up with the carrier says that there
is no disconnects.  The carrier ran a ping monitor between the two 
sites.  Shortly(3 minutes) after the phones go into srst, they will drop
existing calls and register back with the callmanager in singapore.
This seems to happen around once a day and randomly.  Users rarely
report that the internet went down at the same time.  None of their web
sessions or IM clients disconnect.  For example, the phones would
unregister around!
  1am when no one is in the office.  We are running CM 4.1(3) and even
our Australia voice gateways(MGCP) unregister from callmanager.
However, none of the phones in our Singapore office experience any
issues.  Ping times are around 117ms between sites.  Any ideas to get 
this resolved?

Thanks!





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