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🔐 SIP Trunking – Register Method with Kiwi VoIP

The Register Method allows your SIP PBX to connect to Kiwi VoIP using standard SIP registration with a pilot number. It’s ideal when you don’t have a static IP, or when you prefer traditional username/password-based authentication.

🧭 Two Setup Options Available
Choose the best configuration for your setup:

1️⃣ Account-Level Register Trunk
📌 One pilot number authenticates all numbers on your account.

2️⃣ Line-Level Register Trunks
📌 Register and manage each number individually for more granular control.

🔧 Account-Level Register Trunk Setup

  1. Log in to 👉 https://portal.kiwivoip.co.nz

  2. Go to Cloud PBX

  3. Select the Pilot Number

  4. Navigate to Preferences > Register Trunking


  5. Tick ✅ Enable register trunking on this account (make this number the pilot)

  6. Click Save

📌 Once enabled, all voice numbers on the account will route via the registered pilot.

⚙️ Optional Settings

  • Preserve DDI Information:
    Retains the original dialed number in SIP headers — only use if your PBX supports multiple DDIs on a single registration.

  • Enable Outbound Trunking on This Line:
    Allows you to present any DDI on the account as caller ID without registering each number separately. Useful for businesses with multiple departments/DDIs.

📝 Note: Removing the pilot number will deactivate the trunk. You'll need to reconfigure the logic for any numbers remaining on the account.

🔧 Line-Level Register Trunk Setup

For when you want to mix registration and routing across lines.

Step 1: Inbound Trunking Setup

  1. Go to Cloud PBX > Inbound Calls > Call Forwarding or Trunking

  2. Select the DDI you want to trunk

  3. Choose the Pilot Number from the dropdown

  4. Tick ✅ Preserve DDI information on Inbound trunked calls (optional)

  5. Click Save


Step 2: Outbound Trunking Setup

  1. Select the Pilot Number in Cloud PBX

  2. Go to Outbound Calls > Outbound Trunking

  3. Tick ✅ Enable outbound trunking

  4. Click Save

📤 Caller ID Presentation Options

  • Display Name:
    On most IP phones, softphones, and Asterisk-based PBXs, you can change the name part in callerid= or use CALLERID(name) in the dial plan to define the presented number.

  • P-Asserted-Identity (RFC 3325):
    Advanced users can use this SIP header to present an alternate caller ID — supported by many modern PBX systems.

🧠 Pro Tip: After enabling outbound trunking, you can dynamically present any number on your account as your outbound caller ID — as long as your PBX sends the correct SIP headers.