# Purchase a DID on Vonage Platform
Before placing or receiving calls, you must have at least one active DID (phone number) on your Vonage account.\
If you already have one or more active DIDs, you may skip this section.
#### Step 1: Buy a DID Number
1. Sign in to your [Vonage ](https://ui.idp.vonage.com/ui/auth/login)account.
2. Navigate to **Build & Manage > Numbers > Buy Numbers**.
3. Search for available numbers by **country**.
4. Select the number(s) you want to purchase:
* Ensure **Voice** capability is enabled.
* **SMS** capability is optional—select it only if you plan to use SMS/MMS services.
5. Click **Buy** to complete the purchase.
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### Next Steps
After purchasing the DID number(s), proceed with one of the following guides to configure the Vonage SIP trunk in PortSIP PBX:
* [Configuring Vonage IP Authentication Trunk](/portsip-communications-solution/configuring-sip-trunks/vonage-sip-trunk/configuring-vonage-ip-authentication-trunk.md)
* [Configuring Vonage Register Authentication](/portsip-communications-solution/configuring-sip-trunks/vonage-sip-trunk/configuring-vonage-register-authentication-trunk.md)
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