Install IP PBX

I am seeking a techie, who could install IP based PBX on my cloud setup. It will be a software based PBX either 3CX or any other asterisk based. Here are the precise requirements:- 1. Install and configure IP based PBX system.(Product shall be decided mutually). 2. Configure TLS/SRTP to traverse voice over ssl. 3. Ensure that traffic is passed through blocked gateways. 4. Configure auto provisioning for IP Phones and mobile clients. 5. Mobile clients must be compatible across various OS. 6. Configure SIP trunk for International calls (preferably google voice). 7. Any other work that shall be required for smooth implementation and functioning.