Objective:

Need virutual US or UK PSTN number , can access incomming call from the same.

Solution:

for US Number
register for a sip account using www.antisip.com and mape it using ipkall.com(where u can get pstn number).

for UK Number
www.sipgate.co.uk

Enjoy Simple isn't it

Almost all corporates are using SIP phone, how about in asia. does anyone can share idea