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Extensions

Super AdminTenant Admin

Extensions are the SIP voice accounts that your users, desk phones, and softphones register with to make and receive calls. Each extension has a number and a SIP password, and saving it updates the phone system immediately.

ICTPBX extensions list

Adding an Extension

  1. Go to PBX › Extensions
  2. Click Add Extension
  3. Enter the extension number (e.g. 1001) and a SIP password. The form suggests the next free number and warns you if a number is already in use. Numbers only need to be unique within your tenant.
  4. Set the extension type: Voice for regular calls, Fax for inbound fax delivery (then enter a Fax Delivery Email)
  5. Optionally choose the portal user in Assign to User. That user then sees the extension on PBX › My Extension.
  6. Click Save. The change applies immediately.
  7. Set the name callers see on the Caller ID tab

ICTPBX add extension form
ICTPBX add extension form full page view

Extension Settings

  • Call Recording – on the Call Handling tab: none, local, inbound, outbound or all
  • Forwarding – Forward All Calls, Forward on Busy, Forward on No Answer and Forward if Not Registered, each with its own destination
  • Voicemail – the extension form has no voicemail fields. To give the extension voicemail, create a box with the same number under PBX › Voicemail and pick it as the No Answer or Busy destination on the Forwarding tab. Check messages by dialling *99 followed by the mailbox number (e.g. *991001).
  • Fax Delivery Email – if the extension type is Fax, incoming faxes go to this email as an attachment

ICTPBX extension edit form

Extension numbers must be unique across all PBX resource types within a tenant domain. If the system blocks your number, check ring groups and conference rooms for conflicts.

Registering a Phone

To register a phone or softphone app, point it at your PBX host on port 5080 (UDP or TCP). The username is the extension number and the password is its SIP password. For the domain, use your tenant’s SIP domain. You’ll find it on PBX › My Extension. The built-in browser softphone only needs the extension and SIP password.

Package Quotas

Your tenant’s service package defines a maximum number of extensions. When you hit that limit, ICTPBX blocks new extension creation and shows a clear message. Contact your Super Admin to upgrade the subscription package if you need more slots.

Related Features

  • Devices – register desk phones and ATA adapters to extensions
  • Voicemail – manage voicemail boxes and greetings
  • My Account – end users view their SIP credentials here