voip app for windows mobile

This project received 6 bids from talented freelancers with an average bid price of $1519 USD.

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Project Budget
$500 - $2000 USD
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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.

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