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A SIP trunk connects your own phone system (your PBX) to FireTone:
  • your PBX’s outgoing calls go out through your provider’s carriers, billed to your organisation at your rates;
  • your numbers can ring your PBX.
SIP trunks is in the menu when your provider offers it.

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Your allowance

Your provider sets how much you may create for yourself. The card at the top of SIP trunks shows it as bars: A bar full is a limit reached, not a fault. Ask your provider to raise it. If the card says your organisation cannot create trunks, trunks your provider set up for you are still listed, and you can still read their pages and reset their passwords.

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Creating a trunk

SIP trunks → New client trunk. Give it:
  • a name;
  • a concurrent-call limit and a calls-per-second limit (both required, and inside what your allowance has left);
  • the codecs your PBX speaks;
  • if you like, the countries it may call and a tech prefix your PBX adds to every number.
The trunk signs in with a password unless your allowance allows fixed-IP sign-in and you choose it. When you save, PBX settings opens with what to type into your PBX: the server, the username and SIP domain, and the password.
The password is shown only now. Copy it into your PBX before you close the window. If you lose it, Reset password issues a new one, and your PBX stops working until you enter it.

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Caller ID

Your trunks present only your organisation’s own numbers. If your PBX sends another number, it is replaced by the trunk’s default caller ID. Other caller-ID policies are for your provider to set.

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Numbers that ring your PBX

To send one of your numbers to your PBX: Numbers → edit → Destination → Client trunk. A password trunk must be registered for the call to reach it.

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When calls fail: the trunk’s page

Click a trunk’s name.
  • Now shows whether your PBX is registered, the calls up now, and any sign-ins refused today.
  • Limits shows your calls against the trunk’s limits.
  • The tabs hold the history:
    • Sessions: registrations now and in the last 7 days;
    • Sign-ins: refused attempts, with the reason;
    • Calls;
    • Changes: who changed the trunk.

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What you cannot change

  • Your allowance. Your provider sets it.
  • Caller ID beyond your own numbers.
  • Settings your provider made on a trunk. They are kept when you edit it.