SIP & MRCP Protocol Development -- 2

I'm looking for an experienced developer to implement SIP and MRCP protocols. The main focus will be on SIP and all components of MRCP integration on Cisco PBX

Key Requirements:
- SIP Protocol
- MRCP Components: TTS, ASR, Speaker verification/identification

Ideal Skills and Experience:
- Strong background in SIP and MRCP protocols
- Experience with TTS, ASR, and speaker verification technologies
- Ability to design and implement robust media negotiation strategies

We need to code & develop SIP server of our own without open source!!

Please provide examples of similar work done and relevant qualifications.