Hi All,
I have a 2762ac fitted at home and want to use an ipPhone via VPN to our office.
I can't hard wire the phone to the router as its in another part of the house. Is it feasible to to add an 810 AP to the wireless network then plug the phone into that?

Be careful with this. I use a 9630 Avaya, and when I use my VM connection through a SH3, the jitter breaks the IPSEC, so I can only imagine using Wifi with contention is going to be a nightmare.

If I were you, I'd make the effort and run some CAT5.