Modify open source Android sip phone -- 2

Modify sip client open source, we need to modify the audio input and the audio output points of the sip client to only take it from USB , the goal of this project is to be able to make a normal call on your android phone and in the same time to talk on the sip client connected to the headset , how we are testing this project , 1. connect USB audio or headset to the USB you can see image in the doc 2. we will give you a sip account to connect the modified sip 3. if you are able to talk in the headset on the sip and on the phone the job is done ,,,, the budget is 200 dollar , we will give 200 bonus the bonus will be given after 15 days since we have to tested on many devices . please apply only 200 dollars . here is the link of how USB audio look like and and the link of the opens ource sip
1. https://www.amazon.com/Sabrent-External-Adapter-Windows-AU-MMSA/dp/B00IRVQ0F8/ref=sr_1_3?dchild=1&keywords=usb+audio&qid=1624982085&sr=8-3
2. https://www.linphone.org/