Sip-to-GSM gateway for Android - repost

Avg Bid (USD)
Project Budget (USD)
$250 - $750

Project Description:
Need application for Android which use WiFi network to terminate call to or originate from GSM network to SIP.
Related existing project is like chan_datacard module for Asterisk which use AT commands for establish and terminate GSM calls. Application should have option to use outbound proxy server or VPN for ability working in networks with restricted or closed Sip ports.

Skills required:
Android, Mobile Phone, VoIP
About the employer:
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