VoIP Setup with Zoiper Customization

I am looking for a professional who can help me with my VoIP setup. I have a Zoiper Android app that needs to be connected to a VoIP service to increase my privacy and anonymity. This project is focused on the caller ID feature, specifically the need to turn it into a free one.

Key requirements:
- Connect Zoiper to VoIP: The freelancer should be able to establish a reliable connection between my Zoiper app and a VoIP service.
- Caller ID Customization: The most crucial aspect of this project is to turn the caller ID into a free one. This requires a certain level of technical expertise.
- Region Support: While I do not have any specific requirements for region support, the chosen freelancer should be able to work with global coverage.

Ideal skills:
- Experience with VoIP systems and services
- Proficiency in working with Zoiper Android app
- Deep understanding of caller ID customization
- Ability to maintain privacy and anonymity in VoIP setups

I am looking for someone who can deliver a seamless and secure VoIP setup that meets my needs. If you have the skills and experience to tackle this project, I'd love to hear from you.