VPN Problems - HELP!

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Here is our scenario. We have a head office in London with a SBS
server running a SQL database and exchange. We have a 1meg leased
line with a draytek 2900 handling VPN connections. the 2900 has PPTP
dial in connection profiles setup to allow the remote sites to dial
in.

One of the remote sites (in spain) is running 5 x Avaya IP phones
(connecting to the head office phone system) and using a terminal
server (in the head office) to run the SQL database and read emails.
They have ADSL (1MB up 256k down).

The problem is that although the VPN stays up constantly with very
little disruption our users in spain report that the quality of phone
calls is poor and the terminal server will respond slowly (which is
definatley not a performance problem, for example if we connect from
another VPN site the TS responds perfectly.) Also the spain users can
use the TS over companyweb and it works fine.

Any advice on this or any other suggestions? QoS has been suggested
but we have little/no experience of implementing it......

Are the Drayteks sophisticated enough to cope with this VPN traffic?

Any help much appreciated.

.

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