Sip To Whatsapp Call

I am looking for a freelancer who can integrate SIP to Whatsapp call functionality for both mobile and desktop platforms. The integration should include basic call functionality without any advanced or customized features. Standard security features, such as encryption, should be implemented for this integration.

i need use android as voip gateway. inbound calls via sip protocol into outbound calls via WhatsApp

Ideal Skills and Experience:
- Experience in integrating SIP to Whatsapp call functionality
- Proficiency in mobile and desktop application development
- Strong understanding of security protocols and standards