[cisco-voip] Link to primary CCM fails while logged inwithExtension Mobility

Wed Jun 28 17:47:29 EDT 2006

SRND states the goal of SRST is WAN link failure.  

I've seen this debated about whether it works or not, phones in parts of
Africa lose the T1 and the power, and don't register under SRST when
power is restored.

-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Justin
Steinberg
Sent: Wednesday, June 28, 2006 4:38 PM
To: Lelio Fulgenzi
Cc: cisco-voip at puck-nether.net; Ted Nugent
Subject: Re: [cisco-voip] Link to primary CCM fails while logged
inwithExtension Mobility

I'm going to retract my earlier statements.

After shutting down the CallManagers completely, the 7960 (FW 7.22)
phone does not register back to SRST router after power cycling the
phone.

Perhaps the phone needs to TFTP from the CCM before it can register to
the SRST router.

This seems like a limitation of SRST.  I can see a bad storm knocking
out a T1 line and commercial power.

Is there something I'm missing or is the answer to have a PoE switch
and a SRST router on a UPS?

Justin

On 6/28/06, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
>
> I'm wondering if stopping the CCM service is enough of a test. Could
there
> perhaps be another service that the SRST router is connecting to?
>
> I don't see how the SRST router and phones can continue to operate
after a
> reboot if connectivity to the cluster is lost.
>
>
------------------------------------------------------------------------
--------
>
> Lelio Fulgenzi, B.A.
> Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
> (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> "I can eat fifty eggs." "Nobody can eat fifty eggs."
>
> ----- Original Message -----
> From: Justin Steinberg
> To: Ryan Ratliff
> Cc: Lelio Fulgenzi ; Ted Nugent ; cisco-voip at puck-nether.net
> Sent: Wednesday, June 28, 2006 4:13 PM
> Subject: Re: [cisco-voip] Link to primary CCM fails while logged in
> withExtension Mobility
>
> I did a little afternoon testing on this power cycle question I had.
>
> I registered a 7960 running FW 7.2(2) to CCM in my lab and then
> stopped the CCM service.  The phone successfully failed over to my
> SRST 3.3 router.
>
> Then I power cycled the SRST router and when the router came back
> online the phone registered back to SRST with the correct DN.
> Rebooted the phone and it still reregistered with the correct DN.
>
> It even registered back to SRST with the correct DN after power
> cycling the phone and SRST router at the same time.
>
> I then power cycled the router and did a factory reset procedure on
> the 7960, choosing to save the network config during the process.
> After the phone reset it registered back to the SRST router but
> without any DN.
>
> So the phone must save the most recent DN somewhere in flash and
> retains this even through power failure.
>
> I did not test this with EM.
>
> Justin
>
>
>
>
> On 6/28/06, Ryan Ratliff <rratliff at cisco.com> wrote:
> > My 7970 kept the EM dn through a power cycle while in SRST mode.
> >
> > -Ryan
> >
> > On Jun 28, 2006, at 9:38 AM, Justin Steinberg wrote:
> >
> > This isn't specific to EM.   But what happens if you are operating
in
> > SRST mode and you lose power to all the phones and the SRST router.
> > Do the phones or router keep record of their last DN in flash or
would
> > you be completely down after power came back with access to the CM
> > cluster still unavailable.
> >
> > Justin
> >
> > On 6/28/06, Lelio Fulgenzi <lelio at uoguelph.ca> wrote:
> > >
> > > I would expect the same to happen if the PUB went down and access
> > > to the
> > > SUBs was still available.
> > >
> > > Can I assume that during this time, no logins or logouts would be
> > > possible?
> > >
> > >
> ----------------------------------------------------------------------
> > > ----------
> > > Lelio Fulgenzi, B.A.
> > > Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G
2W1
> > > (519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
> > >
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > > "I can eat fifty eggs." "Nobody can eat fifty eggs."
> > >
> > > ----- Original Message -----
> > > From: Ryan Ratliff
> > > To: Ted Nugent
> > > Cc: cisco-voip at puck-nether.net
> > > Sent: Wednesday, June 28, 2006 9:28 AM
> > > Subject: Re: [cisco-voip] Link to primary CCM fails while logged
in
> > > withExtension Mobility
> > >
> > > I just tested with a 7970 and when the phone drops into SRST mode
it
> > > keeps the EM profile dn(s).  Since you don't configure ephone/dns
in
> > > SRST the phone keeps whatever dns it had before it unregistered
> > > with CM.
> > >
> > > -Ryan
> > >
> > > On Jun 28, 2006, at 8:19 AM, Ted Nugent wrote:
> > >
> > > The phone resets and goes to it's default profile. EM
> > > will not work in SRST since the EM service runs on CCM
> > > which is not longer in the picture
> > >
> > > --- Anthony Kouloglou <akoul at dataways.gr> wrote:
> > >
> > > > Hi Ryan,
> > > > i am sorry that i didn't clarify it but i was
> > > > refering to the situation
> > > > where there is an SRST involved:
> > > > there is a CCM cluster and an SRST configured at the
> > > > Device Pool to the
> > > > remote site.
> > > > At the remote site a user logs in with EM but at the
> > > > USER device profile
> > > > there is no reference about the device pool.
> > > > What happens to that phone while it is logged in
> > > > with EM and the remote
> > > > site loses connectivity with all the CCM cluster?
> > > >
> > > > Cheers
> > > > Anthony
> > > >
> > > > Ryan Ratliff wrote:
> > > >> Just to clarify when you login with EM it actually
> > > > changes the
> > > >> database so no matter which server the phone
> > > > registers with as long as
> > > >> that EM profile is logged in the phone will get
> > > > the EM lines.  The
> > > >> user won't get automatically logged out or
> > > > anything just because the
> > > >> phone fails over to another server.
> > > >>
> > > >> -Ryan
> > > >>
> > > >> On Jun 27, 2006, at 11:04 AM, Ryan Ratliff wrote:
> > > >>
> > > >> The phone will act just like it would if you were
> > > > not logged in with
> > > >> EM, ie it will register with the backup
> > > > CallManager server.
> > > >>
> > > >> -Ryan
> > > >>
> > > >> On Jun 27, 2006, at 10:25 AM, Anthony Kouloglou
> > > > wrote:
> > > >>
> > > >> Hi all,
> > > >> if a user is logged in with extension mobility,
> > > > and the link to the
> > > >> primary ccm fails what happens with that phone?
> > > >>
> > > >>
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