SIP in higher education

[Jeremy George <>]

Hey Steve,

  Primary proxy, backup proxy and outbound proxy are all configurable
phone parameters.  The problem is that there isn't a backup outbound
proxy parameter so if primary and outbound are configured for the same
machine, one direction failsover appropriately and the other doesn't

  Everything is configured by IP address so I don't _think_ DNS is
involved at all.

- Jeremy


On Fri, 4 Feb 2005, Steve Blair wrote:

> Date: Fri, 04 Feb 2005 12:38:37 -0500
> From: Steve Blair 
> <>
> To: Jeremy George 
> <>
> Cc: 
>
> Subject: Re: [sip.edu] Backup proxies
>
>
> Jeremy:
>
>  In my experience these phones resolve the SRV record
> once upon boot then not again until reboot. Perhaps they
> actually resolve the record upon registration/re-registration.
> I haven;t had a chance to try that.  Maybe as an alternative
> you could define a backup_proxy for the phone. I'm not
> sure how this would work if you only have one
> SRV record for your domain.
>
> -Steve
>
> Jeremy George wrote:
>
> >   I have Cisco's CSPS v2.2 configured as the primary proxy and Iptel.org's
> > SER v0.8.14 configured as a backup proxy.  I'm using Cisco 79XX phones
> > configured for those servers and using CSPS as an outbound proxy.
> > Additionally I have a Cisco 37?5 gateway configured to use a hunt group
> > inbound from the PSTN, preferring CSPS and then trying SER.
> >
> >   Testing the failover this morning by shutting off CSPS showed that
> > inbound calls went immediately to SER without missing a beat.  The
> > biggest problem might be that I could lose my primary proxy without
> > knowing it.
> >
> >   However, outbound calls seem to require manual re-configuration on
> > the phones.  Is this right?  Does anyone know of a way to get 79XXs
> > to failover the outbound proxy automatically to a backup?
> >
> > - Jeremy
>
>
> --
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> The University of Pennsylvania
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