[cisco-voip] SRST and standby SUB?

[Wes Sisk]

One more variable I do not see in Ryan's response - Geometric TCP.  With 
Geometric TCP enabled the phones failover MUCH more aggressively.  With 
this phone may determine CM is down with only 1.5 second network 
outage.  With Geometric TCP disabled phone may wait up to 45 seconds to 
classify cm as "down" and attempt failover.

CSCsm81227.

/Wes

On Monday, May 11, 2009 11:55:08 AM, Ryan Ratliff <rratliff at cisco.com> 
wrote:
> So coming back from SRST there are 3 things that have to happen before 
> the phone will re-register.
> 1. Establish TCP connection to one of the CMs
> 2. Wait out the "Connection Monitor Duration" timer so it knows the 
> connection is stable (Enterprise Params, default 120 secs)
> 3. Request and receive a registration token from the server indicating 
> that it can proceed with registration.
>
> Both connection monitor duration and the registration token mechanisms 
> are in place to make sure the failback process is as fast and 
> problem-free as possible.
>
> In your case is there anything between the sites that could be 
> proxying the tcp connection from phone to CCM?  All "Standby" means is 
> that there's a TCP session established but it's not actually registered.
>
> Your best bet is going to be to reset the phone and get a packet 
> capture.  look at the traffic on tcp 2000 to the CCM servers to see 
> what's going on.
>
> -Ryan
>
> On May 11, 2009, at 11:43 AM, Scott Voll wrote:
>
> no
> sub
> pub
> srst
>
>
> all via IP addresses
>
> sub -- Standby
> pub
> SRST -- Active
>
> Scott
>
> On Mon, May 11, 2009 at 8:41 AM, Ryan Ratliff <rratliff at cisco.com> wrote:
> On the phone what is the list of Communications Manages?  Does it 
> somehow think the SRST is higher in priority than the sub?
>
> -Ryan
>
>
> On May 11, 2009, at 11:29 AM, Scott Voll wrote:
>
> I'm banging my head on a wall.  What am I missing?
>
> have a remote site over IPSEC VPN connection back to central CM cluster.
>
> all has been working fine. but today I find that the three phones 
> (all) are in SRST mode.  the VGW is still registered to the cluster. 
> but from the web interface of the phones shows reg'd with SRST and 
> standby with SUB.  How does that work?
>
> I don't really understand the logs on the 7942.
>
> I can ping from the sub and pub to the phones.  any ideas?
>
> I can attach logs from the phone is that helps.
>
> Thanks
>
> Scott
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