It depends on the phone - if it's an actual VoIP phone, it doesn't have to be plugged into any particular device.
The VoIP (rather than VPN) "socket" that I think blastman's thinking of is a built-in ATA (Analogue Telephone Adapter) for connecting analogue phones. While you could connect a separate ATA to a wireless bridge and then to the router, you obviously can't connect an analogue phone directly to the wireless bridge.
It depends on the phone - if it's an actual VoIP phone, it doesn't have to be plugged into any particular device.
The VoIP (rather than VPN) "socket" that I think blastman's thinking of is a built-in ATA (Analogue Telephone Adapter) for connecting analogue phones. While you could connect a separate ATA to a wireless bridge and then to the router, you obviously can't connect an analogue phone directly to the wireless bridge.