Service 05
Twilio & SIP Voice AI Integration
Put an AI agent on a real phone number. Twilio Media Streams or SIP trunking, inbound and outbound calling, warm transfer to a human, and call recording that satisfies your lawyers.
What this service covers
A voice agent in a browser tab is a demo. A voice agent on a phone number is a product, and the telephony layer is where most of the unplanned work turns up. Phone audio arrives as 8kHz mulaw, not the clean 16kHz your model was tested on. Networks jitter. DTMF still matters. Calls need to transfer to a human without dropping context, and in most jurisdictions recording needs consent handled correctly.
I wire agents into the phone network through Twilio Media Streams or a direct SIP trunk into LiveKit, covering inbound and outbound calling, warm transfer with the conversation summarised for whoever picks up, voicemail detection so outbound campaigns do not talk to answering machines, and call recording with a retention model you can defend.
Twilio and SIP are different trades, so I will tell you which one fits. Twilio is faster to launch and easier to operate. A direct SIP trunk is meaningfully cheaper per minute at volume and removes a hop of latency. Below a few thousand minutes a month, Twilio almost always wins. The per-minute breakdown is in AI voice agent cost.
What you get
- Agent connected to a live phone number via Twilio Media Streams or SIP
- Inbound and outbound calling, including campaign and callback handling
- Warm transfer to a human with the conversation context carried across
- Voicemail and answering-machine detection for outbound calls
- Call recording, transcripts and a retention policy fit for your jurisdiction
- Per-minute cost breakdown across telephony, speech and model spend
How I work
Four stages, and you always know which one you are in
The same process whether the engagement runs two weeks or a year.
Understand the business
I ask product-level questions before quoting, so the work is scoped against what the business needs, not just the ticket as written.
Architecture in writing
You get the proposed architecture in writing before any code is committed. Disagreements happen on the document, where they are cheap.
Delivery in milestones
Work ships in milestones with regular updates, so you always know what has landed and what is next.
Documented handoff
Code is documented and handed off cleanly. Your future engineers should not have to reverse-engineer my decisions.
Direct Project Enquiry
Tell me what you are building
Share what you are building and where it is stuck. If a managed platform already solves it, I will say so. I review every enquiry personally and reply within about four hours.
- 1Send your project goal and the services you think you need.
- 2I review the context and whether I am the right fit.
- 3You get a direct reply with a practical next step.
International projects welcome
I work in English by email, video call or through Upwork, from GMT+7 with overlap hours for US and EU teams.
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