Overview
Connecting with custom telephony providers using SIP
Created: April 25, 2025
Updated: September 16, 2026
Introduction to VINSI Custom Telephony
In this article, we will demonstrate how to integrate VINSI agents with your telephony providers and use your numbers. The process is independent of the agent you are utilizing.
Ways to integrate with your provider.
- Elastic SIP Trunking
- Dial to SIP Endpoint
sip:lk.vinsi.aiBusiness Phone System
VINSI also runs your team's phones — browser softphones, desk phones, hunt groups, call queues, and voicemail. Start with these guides:
| Guide | Covers |
|---|---|
| Phone Numbers & Caller ID | Buying numbers, the main line, caller ID, CNAM |
| Softphone | Adding phones for members and calling from the browser |
| Desk Phones | Fanvil provisioning, busy-lamp keys, feature codes |
| Voicemail | Greetings, email notifications, *97 |
| Business Hours | Open hours and after-hours routing |
| Hunt Groups | Ringing a team from one number |
| Call Queues | Holding callers until an agent is free |
| Skills-Based Routing | Ringing the best-suited people first |
| Call Center | Supervisor wallboard, coaching, alerts, reports |
| Call Screening | Spam screening and blocked callers |
Elastic SIP Trunking (Recommended)
We recommend this approach when integrating with providers that support elastic SIP trunking.
You’ll need the following:
- Set up a SIP trunk.
- Configure your number to point to it.
- Import that number to VINSI.
Elastic SIP Trunking is a cloud-based solution that connects your IP-based communication systems (like VoIP or PBX) to the Public Switched Telephone Network (PSTN). It allows businesses to make and receive phone calls over the internet without needing traditional phone lines. Suitable for organizations needing global coverage, redundancy, and integration with PSTN for inbound and outbound calls.
The "elastic" part refers to its ability to scale up or down automatically based on your call traffic needs, offering flexibility and cost efficiency. Providers like Twilio offer this service with features such as global coverage, pay-as-you-go pricing, and enhanced security.
Telephony provider guides:
Dial to SIP Endpoint
When to use:
- SIP trunking is not supported by your provider
- Your telephony setup is complex
- You are unable to utilize elastic SIP trunking.
- Calls can be routed to a specific SIP endpoint.
The key difference between Dial to SIP Endpoint and Elastic SIP Trunking lies in their use cases and functionality:
Dial to SIP Endpoint involves directly dialing a specific SIP address or URI (e.g., sip:username@domain.com) to connect calls to a SIP-enabled device or application.
It is typically used for point-to-point communication, bypassing traditional phone networks.
Ideal for setups where calls need to be routed to specific SIP endpoints without requiring PSTN connectivity.