The managed voice network will provide communications between Ashford St Peters, Frimley Park and the Royal Surrey hospitals and a network of clinics and surgeries using NTL's network rather than dedicated circuits between sites. This will enable other sites to opt in at a later date.
Using NTL's network via an access code means that community sites can make internal calls free of charge.
Senior systems engineer at Ashford & St Peters, Darren Baber, said this would save the community £110,000 a year - 40% of last year's total telephony costs.
Given that many NHS organisations use more than one site, there could be huge scope for savings across the health service.
The move to a single supplier has simplified the management of relationships.
Supplier pressure on community executives was key in driving West Surrey's reappraisal of its communications procurement.
Baber said, "About a year ago suppliers were contacting community executives, trying to get a foot in the door and asking how much our telecoms were costing."