Re: IP phone setup remote location

On Sat, 04 Aug 2007 03:04:34 +0000, Robert Bonomi wrote:

It seems to me the things that could be causing the problem are: switch
here, firewall here, dsl router here, these three at the remote location
or it could be the tunnel.

Anyone have any ideas on where to start trouble shooting?

Symptoms _tend_ to indicate dropped packets, and/or 'high jitter'
issues, "somewhere" between ends.

Things 'nominally' under your control are local link speeds, and the
degree of utilization of the bandwidth on each end.

Also, look at processor utilization levels on the devices that terminate
the tunnel.

Another possibility is PMTUD failure. due to overly paranoid firewall
rules at any point between the two locations.

If the same provider is servicing both locations, you can probably
arrange for a VPN _with_ QOS prioritization of VoIP traffic.

If the locations are serviced by different providers, you're on towards
'out of luck' for constructive QOS prioritization.

Yes, the two locations are serviced by different providers. Hmm.

I'm wondering if it would help to get a VPN router from Nortel. Just
browsing around on their website, it sounds as though it may help but
I'm not sure where the bottleneck is.
.

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