AI Voice Agents + SIP: What Does the Ideal Telecom Stack Look Like?

AI voice agents are becoming a major part of business communications, but connecting them reliably with SIP, VoIP infrastructure, PBX, CRMs, and contact centers is where things get interesting.

For those building or deploying AI voice solutions:

What does your ideal AI voice stack look like?

Do you prefer:

SIP → Voice Provider → AI Agent → CRM

or a more integrated CPaaS/contact-center approach?

And what are the biggest challenges you've faced with latency, call routing, number management, recording, compliance, or integrations?

Would be great to hear from VoIP providers, SIP vendors, CPaaS platforms, developers, and AI voice companies.