Custom iOS Call Spoofer Development

I'm in need of an iOS Call Spoofer that allows me to change the caller ID to anything I want, specifically for calls to the UK and Ireland.

And SMS spoofing

Key Requirements:
- SIP compatible with soft phone like zoiper
- Functionality to change the caller ID

Ideal Skills and Experience:
- Proficiency in Asterisk and PBX
- Prior experience with call spoofing technology
- Understanding of telecommunication regulations in the UK and Ireland