voip app for windows mobile

Avg Bid (USD)
Project Budget (USD)
$500 - $2000

Project Description:
I want to develop voip app for windows mobile phones.

i am looking for developer for the following modules:

1. GUI, this should include handeling all the db (for contact, call logs and settings, etc.)

2. audio engine - interfacing with the microphone, speaker (ear piece and load speaker). raw pcm should be delivered and speex vocoder should be used to cmpress and decompress the signal.

3. sip signaling - integrating pjsip into the app.

i would like to recieve proposition as per module.

Skills required:
Android, Blackberry, Engineering, iPhone, MySQL, PHP, Project Management, Software Architecture, Software Testing
About the employer:
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