VPN/Voip port related question.
May be my ISP blocked sip port 5060 or they have some voice packet senceing machanism, I used to make voip calls through my linksys ATA (SIP) which, I can't use any longer.
I tried to implement vpn (IPSec) but seems like its also not working.
This device Linksys SIP ATA only working if i dial to (make PPTP connection) vpn server.
my question is, how can I make sure, which port My ISP has blocked and my 2nd Question is: can anyone tell me, IPSec use which ports ?