vpn disconnect problem-- briteport 8120 modem

I have a client who has a Briteport 8120 DSL modem. We set him up to
connect remotely into his office machine (going through his server) via
vpn. The problem is that he gets disconnected everytime after about 4
minutes. At first it was every 2 minutes. I updated windows xp (laptop
has XP home, desktop has XP Pro), checked the settings on the briteport
modem to allow the vpn to go through. I believe it has to be the modem
because the laptop will work from my house. Is anybody familiar with
this modem and what other settings I should check.

Randy

.

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