I know Sipgate cos I have a free 'line' with them (which I don't use a lot). Don't know any others, so...
Have office with around five people. Currently has PBX with one number and three lines in. Two other offices with single lines. Works okay. Want to spend less than on BT!
Need one Main Office user to also get their calls when at their Branch Office desk and also at the Other Office. I think this can be done with a virtual PBX. Can Sipgate and the like be set up so there are phones in different places and the users calls can follow him around without the Main Office having to worry if he's at Branch or Other? If you follow me! Want to transfer incoming call to his extension number and reach him in Main, Branch or Other office.
Between Sipgate and Voipfone, Voipfone seem cheaper - 7 extentions, 10 geo numbers and a call group would be about £18 whereas Sipgate would be £31 for 5 users and 6 geo numbers. OTOH Sipgate's all you can eat calls for £50 seems like a deal.
Most of the other providers I've found have either opaque pricing wise or don't look like good value (thinking of Gradwell).
Any advice or experiences?!