Fix WebRTC WhatsApp Call Issue

I'm seeking a skilled developer to resolve an issue with WhatsApp calling via WebRTC. The call fails to connect, and I am receiving specific error messages.

Requirements:
- Expertise in WebRTC technology
- Experience with WhatsApp integration
- Strong troubleshooting skills
- Ability to analyze and resolve error messages

Ideal Skills:
- Background in real-time communication applications
- Proficiency in networking and connection protocols
- Familiarity with audio/video call setups

Following is the issue
https://stackoverflow.com/questions/79710003/trying-to-implement-whatsapp-calling-api-using-webrtc/79716600#79716600

After this i've tried this setup
https://github.com/arslan1317/whatsapp-calling

But getting following error

Error: invalid sessionDescription