Java VOIP telecom project with automation. Experience in Java & Appium automation & Voip are required

If you don't have experience in VOIP, GSM termination & Appium or any other automation pls don't bid.


Our developer has been at hospital for 5 months, so we need a replacement to start our project. We need to create a new voip software from scratch similar to goip/antrax, the detailed file will be submitted for all the requested features.
The project will be divided into a 3 to 5 milestones.

Coding language should be Java, the essential is to be a very fast software without bugs and without errors or crashes.

The main features will be:
1 - Very high quality voice
2 - Cloud remote control
3 - Can accept bulk calls over 10K calls per second without any crash
4 - Automation (Appium or any other)
5 - Software can work even with low internet speed or 4G with high quality voice

Moreover we would like to have after sale support for 3-6 months making sure that there are no bugs in the software after testing it with some of our clients. And after that, after sale support will be paid.
Pls bid the best price possible in order to establish a long term business relationship.