TelephonyVINSI VOICEPhone Connections
Connecting Your Phone System
How VINSI AI agents connect to the phone numbers and phone systems you already use — Twilio, Telnyx, Mitel, 3CX and Zoom Phone.
Created: September 18, 2026
Updated: September 18, 2026
Overview
An AI agent needs a phone number that callers can reach, and a way to hand calls to your people. You can give it a number from VINSI, connect a number you already have with a carrier, or connect the phone system your team already works in. Which route suits you depends mostly on where your numbers live today and whether the AI needs to reach your staff by extension.
Ways to Connect
| Method | What it is | Set up by |
|---|---|---|
| A number from VINSI | Buy a number in Phone Numbers → Add Phone Number. It runs on the Telnyx network and is ready to use straight away. | You, in a few minutes |
| SIP trunk from your carrier | Keep your number with your own carrier account (Twilio, Telnyx and similar) and connect it with Phone Numbers → Add SIP Trunk. | You, following the carrier guide |
| Phone system through VINSI's SBC | A SIP connection between your office phone system and VINSI's Session Border Controller, so the AI can transfer to extensions and call out through your system. | VINSI, with your phone system admin |
| Call forwarding | Your phone system forwards incoming calls to a VINSI number. No SIP setup at all. | Your phone system admin, in minutes |
Which One Fits
| You use | Recommended route | AI transfers to | Guide |
|---|---|---|---|
| Nothing yet | A number from VINSI | Any phone number | Setting Up Phone Numbers |
| Twilio | SIP trunk (Elastic SIP Trunking) | Any phone number | Twilio |
| Telnyx (your own account) | SIP trunk | Any phone number | Telnyx |
| Mitel MiVoice Business / MBG | Phone system through VINSI's SBC | Extensions and phone numbers | Mitel |
| 3CX | Call forwarding, or VINSI's SBC for extension transfers | Phone numbers (extensions with the SBC route) | 3CX |
| Zoom Phone | Call forwarding | Direct numbers and call-queue numbers | Zoom Phone |
Terms Used on These Pages
| Term | Meaning |
|---|---|
| SIP trunk | An internet phone line between two phone systems. See What is SIP Trunking? |
| Origination | Calls coming in from the phone network. Your carrier sends them to VINSI's address. |
| Termination | Calls going out to the phone network. VINSI sends them to your carrier's address. |
| SBC | Session Border Controller — a SIP gateway that sits between two phone systems and handles security, addressing and audio. |
| DID / direct number | A phone number that reaches one person or queue directly, rather than an internal extension. |
| E.164 | The full international number format VINSI uses, e.g. +18005551234. |
Current Limits
- SIP trunks take US and Canada numbers. The Add SIP Trunk form accepts
+1followed by 10 digits. Contact VINSI if you need to connect numbers from other countries. - Phone system connections through the SBC are set up with VINSI. They aren't self-service yet, because each system needs its dial plan and security matched on both sides.
- Call forwarding covers incoming calls only. The AI transfers and dials out through VINSI, so it reaches your staff on their full phone numbers rather than internal extensions.