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What is Vonage SIP trunking used for in a Bolna voice agent?
A Vonage SIP trunk lets a Bolna voice agent answer calls on your Vonage numbers and place outbound calls through Vonage, with Vonage carrying and billing the minutes. Bolna has a Vonage preset in the SIP trunk wizard. There is no Vonage-specific guide in the Bolna docs, so you follow the general carrier flow with the values from your Vonage account.
How do I set up a Vonage SIP trunk with Bolna?
- In the Bolna dashboard, under Deploy, open SIP Trunks and click Create trunk. Pick Vonage, enter a trunk name and the number of channels (the default is 10).
- In Gateway we dial, enter the host Vonage gave your account. The Vonage preset does not fill this in.
- On the Carrier IPs step, add every signalling IP or range Vonage calls from. The preset links to Vonage's IP page. Add a SIP username and password under Carrier credentials (optional) only if Vonage issued them.
- Add your Vonage numbers in E.164 format, starting with
+, and click Create trunk. - In the Vonage console, send inbound calls to
sip:trunk.bolna.ai:5060, allowlist Bolna's IPs15.252.21.46and13.206.230.198, and keep only thePCMUandPCMAcodecs. - Pick an agent for each number on the trunk's Numbers tab for inbound calls. For outbound calls, set the agent's Telephony Provider to SIP Trunk.
Every field is covered in the Connect your carrier guide in the Bolna docs.
Which values does Vonage need from Bolna?
| Setting | Value |
|---|---|
| Origination URI (inbound) | sip:trunk.bolna.ai:5060, or sip:trunk.bolna.ai:5060;transport=tcp |
| If Vonage accepts only an IP | 15.252.21.46, port 5060 |
| IP allowlist (outbound signalling) | 15.252.21.46 and 13.206.230.198 |
| Media (RTP) | UDP 30000-40000, to and from 15.252.21.46 |
| Transport | UDP or TCP (not TLS) |
| Codecs | PCMU and PCMA |
| DTMF | RFC 2833 |
| Number format | E.164, with or without the + |
| Caller ID | One of your trunk numbers, in E.164 with the + |
What can you build with Vonage SIP trunking and Bolna?
AI agents on numbers you already own. Keep your Vonage numbers and contract, and have a Bolna agent answer them instead of moving to a new provider.
Outbound calling at your Vonage rates. Single calls and batch campaigns go out through your Vonage trunk once the agent's telephony provider is set to SIP Trunk.
One setup across carriers. The same Bolna values work for every carrier, so you can run Vonage alongside Telnyx or Twilio trunks. For any carrier without a preset, see the generic SIP trunk page.