Hello,
I have 10 years of experience in mobile and voip projects development and customisation.
I have developed many software using Asterisk and C, ObectiveC (iOS), Java(Android) like inter-office communication, softphone, remote office authentication, autodialer, preductive dialer, sms schedular, conferencing server, call center, audio/video switch, A2billing.
Let me know if you need more information from me.
Thanks
Bhrugu