VoIP/SIP Engineer for AI Voice Integration
Budget: $250 – $750 USD
We are looking for an experienced VoIP/SIP engineer with expertise in AI voice integrations.
We have already integrated our AI Personal Assistant platform with ElevenLabs and Retell AI. Inbound calls are working successfully across Analog, SIP, Public IP, and CGNAT environments. Outbound calls are working only on Public IP connections and require further assessment and optimization.
Our objective is to build a scalable telephony architecture that allows customers to connect their existing phone numbers (Analog, SIP Trunk, Mobile, PRI/E1, PBX, etc.) to our AI voice platform.
The consultant/freelancer should have strong experience in:
• SIP, VoIP, PBX, and SBC technologies
• Grandstream UCM, HT series gateways, Yeastar, 3CX, Asterisk, FreePBX
• Session Border Controllers (SBC)
• SIP Trunking and Carrier Integrations
• NAT, CGNAT, TLS/SRTP, RTP troubleshooting
• ElevenLabs, Retell AI, or similar AI voice platforms
• Designing scalable multi-tenant voice architectures
• High Availability (HA) telephony environments
Current scale:
• Approximately 1000 potential customers
• Initial requirement: 100 concurrent calls
• Inbound and outbound AI calling
The engagement will include architecture review, solution design, best practices, and hands-on implementation support.
This version will attract the right VoIP/SBC architects rather than general freelancers.
We have already integrated our AI Personal Assistant platform with ElevenLabs and Retell AI. Inbound calls are working successfully across Analog, SIP, Public IP, and CGNAT environments. Outbound calls are working only on Public IP connections and require further assessment and optimization.
Our objective is to build a scalable telephony architecture that allows customers to connect their existing phone numbers (Analog, SIP Trunk, Mobile, PRI/E1, PBX, etc.) to our AI voice platform.
The consultant/freelancer should have strong experience in:
• SIP, VoIP, PBX, and SBC technologies
• Grandstream UCM, HT series gateways, Yeastar, 3CX, Asterisk, FreePBX
• Session Border Controllers (SBC)
• SIP Trunking and Carrier Integrations
• NAT, CGNAT, TLS/SRTP, RTP troubleshooting
• ElevenLabs, Retell AI, or similar AI voice platforms
• Designing scalable multi-tenant voice architectures
• High Availability (HA) telephony environments
Current scale:
• Approximately 1000 potential customers
• Initial requirement: 100 concurrent calls
• Inbound and outbound AI calling
The engagement will include architecture review, solution design, best practices, and hands-on implementation support.
This version will attract the right VoIP/SBC architects rather than general freelancers.