Total 12 years of experience in Software development.
I have been working in VoIP technologies for 12 years and mobile app development 5 years.
I have developed many project using asterisk like autodialer, ivrs, voicemail system, billing module, multiple office pbx setup, international call routing, call traffic routing and more.
I can make your autodialer with answer detection.
What kind of usb modem are you using?