# Setting Up Phone Numbers & SIP Trunks Learn how to purchase phone numbers, assign AI agents, or connect your own SIP trunk to handle inbound and outbound calls in VINSI.AI. Created September 18, 2025 · Updated September 16, 2026 ## Phone Numbers VINSI.AI allows you to purchase and manage phone numbers directly from the dashboard. Open **Phone Numbers** in the AI Phone Agent product (it is also available under **CRM → Admin → Phone Numbers**). The page subtitle reads "Manage your phone numbers and agent assignments". The table lists **Phone Number**, **Trunk**, **Agent**, **Date Added**, and **Actions**. Use the search box ("Search by phone number or agent...") to find a number. The Trunk badge shows your own trunk name, or **VINSI.AI AGENT**, **VINSI.AI PHONE**, or **VINSI.AI FAX**. 1. Click  to purchase a new phone number 2. Enter a 3-digit **Area Code** 3. Click **Search Available Numbers** 4. Optionally narrow the results with "Filter by city or state…" 5. Click a number, then click **Subscribe & Buy ($3/mo)** 6. Complete the Stripe checkout. Once purchased, the phone number will appear in the phone numbers table Numbers cost $3/month each, and you can cancel anytime. Buttons on this page require an organization admin or the phone\_numbers write permission. ## Assign AI Agent A number doesn't have to be assigned to an AI agent—it can also be a member's line, a hunt group, a queue, or a fax number. See [Phone Numbers](https://docs.vinsi.ai/telephony/phoneNumbers) for those uses. To have an AI agent answer a number: 1. Locate the phone number in the phone numbers table 2. Use the dropdown in the **Agent** column 3. Select the AI agent you want to assign (choose **No Agent** to clear it) 4. The selected agent will now manage calls for that number **Note:** If the number is already in use, you'll see "This number is in use". Click **Assign agent anyway** to assign it regardless. ## Number Actions | Action | Notes | | ----------------------------- | ---------------------------------------------------------------------- | | **Edit SIP Trunk** | Manually configured SIP trunks | | **Set Caller-ID Name (CNAM)** | Telnyx numbers | | **Repair routing** | Telnyx numbers with an agent assigned | | **Release Phone Number** | Paid numbers also cancel their subscription. Unassign the agent first. | ## Using Your Own SIP Trunk If you prefer to use your own SIP infrastructure instead of purchasing a phone number, you can connect a SIP trunk. 1. Click  from the Phone Numbers section 2. Fill in the **Configure SIP Trunk** fields:  - **Trunk Name** (required) — a label to identify this SIP trunk in your account - **Phone Number** (required) — enter the number in E.164 format (e.g. `+18001234567`) - **Inbound Call Setup** — to receive inbound calls, set your **Origination SIP URI** at your provider to the URI shown in the modal, with **weight = 1** and **priority = 1** - **SIP Termination URI** (required) — the SIP URI where outbound calls will be terminated (e.g. `sip:example.com:5060`) - **SIP Username / SIP Password** (optional) — credentials if your provider requires authentication 3. Click **Configure Trunk** to save and activate the SIP trunk To change a trunk later, use **Edit SIP Trunk** and click **Save Changes**. Leave the password blank to keep the current one. For more details, see the related article: [Elastic SIP Trunking With Twilio](https://docs.vinsi.ai/ai-phone-agents/elastic-sip-trunking).