Need sip wrapper in android

Avg Bid (USD)
Project Budget (USD)
$750 - $1500

Project Description:
I am looking for someone to create a JAVA wrapper for sip in android using pjsip.
The library should have the following functionality:
- Register phone with server
- Make call
- Standard call backs for all events
- Support for Bluetooth, speaker and earpiece on/off
- Support for video calls
- UN-register device

We don't need any UI components for this. The wrapper should provide an interface that we can directly integrate with our UI.

Skills required:
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