I am a mobile app developer. I want a SIP dialer with my own server , i have a VOIPROUTE from (VOIPROUTES.COM). I want to use the sip for calling to pakistan, India and Bangladesh . i want a dialer like Platinum Dialer( you can find it on itunes,google play,etc) for that i have to use a soft switch like (itel switch ). How can i do all these things my own . How can i make a server for sip through which my is connected to make a call .
And i hvae a question weather the app call directly to the sip ( voiproutes.com server ?) server or first it goes to my server where i do billing for that user .??
Which is best suited thing for me to do ??
Thnaks a lot.