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If you already have phone numbers with a carrier, use Connect Your Own to import them and connect via SIP trunks instead of buying numbers through the marketplace. Access: Navigate to Telephony → SIP Trunks Common providers for this setup include Twilio, Telnyx, Vonage, and other SIP-capable carriers.

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SIP Trunk List

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Creating a SIP Trunk

Click Create SIP Trunk. The dialog is split into Inbound and Outbound tabs.

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Inbound

Use the inbound tab to copy your itellicoAI inbound URI and restrict which source IPs are allowed to send calls into the trunk. Your itellicoAI inbound SIP URI is:
Configure your carrier to forward calls to this URI.

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Outbound

Use the outbound tab to configure: You can delete a SIP trunk only after unlinking any phone numbers that still use it.
Use a saved secret for SIP authentication so you can rotate credentials centrally later.

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Static SIP IP Ranges

itellicoAI’s SIP traffic egresses from a fixed set of static IP ranges, which your carrier or firewall can whitelist. These ranges are shared infrastructure and not exclusive to itellicoAI, so when your carrier supports SIP credentials, the allowlist should complement them rather than replace them.

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Available IP Ranges

  • 143.223.88.0/21
  • 161.115.160.0/19

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When This Is Relevant

Use the static IP ranges when you:
  • Need to whitelist SIP traffic in firewalls or SBCs
  • Operate in restrictive or security-critical networks
  • Require a stable, predictable SIP connection

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Important

Make sure both UDP and TCP are open on these IP ranges for SIP signalling and RTP media.

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Importing Phone Numbers

Once you have a SIP trunk, import your existing numbers:
1

Go to Telephony → Phone Numbers

Click Add Number → Connect Your Own to open the import dialog.
2

Enter number details

  • Phone Number — International E.164 format (e.g., +43 720 123456)
  • Label — Optional name
  • Forwarded From — If you use number forwarding, the customer-facing number that forwards to this AI number. Shown on your public Trust Center. Leave blank if not using forwarding.
  • SIP Trunk — Select the trunk you created
  • Routing — Choose a fallback inbound agent now, then manage detailed routing from Phone Numbers
3

Save

The platform imports and links the number to your SIP trunk. Configure your carrier to forward calls to itellicoAI’s SIP endpoint. For fallback agents, routing rules, and schedules, use Phone Numbers.

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Next Steps

Phone Numbers

Manage all your numbers in one place

Schedules

Configure routing schedules for your numbers

Agent Editor

Configure the agent that answers calls