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A SIP trunk is the connection between Astradial and a phone carrier (like Tata, Airtel, Twilio, or any SIP provider). Without a trunk, you can make calls between extensions inside Astradial, but you cannot call real phone numbers or receive calls from the outside world.

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What is a SIP trunk?

Think of a SIP trunk like a phone line connecting your office phone system to the telephone network. It is the bridge between your internet-based phone system and the real phone network.

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View your trunks

Go to Trunks in the sidebar under Deploy. You will see a table showing all configured trunks with:
  • Name — A label you gave the trunk
  • Host — The SIP server address and port
  • Type — Inbound, Outbound, or Peer-to-peer
  • Transport — UDP, TCP, or TLS
  • Channels — Maximum simultaneous calls allowed
  • Registration — Whether the trunk is successfully connected to the carrier
  • Status — Active or Inactive

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Create a trunk

Only admins and owners can create trunks.
1

Click Add Trunk

Click the Add Trunk button (plus icon). Only visible to admins.
2

Fill in the connection details

3

Click Create

Astradial creates the trunk and registers it with the carrier. Check the Registration column — it should show “registered” within a few seconds.

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Registration status

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Edit a trunk

  1. Click the three-dot menu next to the trunk
  2. Click Edit
  3. Update any field (leave password blank to keep the current one)
  4. Click Save

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Delete a trunk

  1. Click the three-dot menu next to the trunk
  2. Click Delete
  3. Confirm the deletion
Deleting a trunk disconnects all phone numbers that use it. Make sure to reassign your phone numbers to a different trunk first.

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Get a free developer trunk

If you need a trunk for testing, click the Request Free Trunk button at the bottom of the page. This sends an email to the Astradial team to set up a free developer trunk with 1 channel and 1 Indian DID for 30 days.