An Avaya J-Series phone registers to 3CX by entering the same set of SIP fields directly on the device — either using the phone's own keypad, or through its web GUI once the phone's IP address is known.

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Preparing the Extension in 3CX

Before retrieving the phone's registration credentials, two extension-level settings need to be confirmed.

1. In the 3CX portal, navigate to Extensions and select the extension the phone registers to
2. Under the Options tab, confirm Disallow use of extension outside of LAN is disabled
3. Under the same tab's Troubleshooting section, confirm PBX Delivers Audio is enabled

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Retrieving SIP Credentials from 3CX

1. Select the Phone Provisioning tab
2. Under Authentication, note the SIP Extension and SIP Password — select the eye icon to reveal the password

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Provisioning via the Phone's Keypad

1. On the phone, log into Administration using the default credentials — the login is 27238 (spells "craft")
2. Using the phone's keypad, navigate to the SIP section — approximately 10 clicks down from the Administration menu
3. Under SIP Global Settings, enter the following values:

4. Save and exit SIP Global Settings
5. Resolve the SIP Server Host used for Target Platform to an IP address by running tracert <address> (excluding the port) from a command line, and note the top-most resolved IP
6. Select SIP Proxy List, then select New, and enter the resolved IP address with Protocol set to TCP and the SIP Port set to the value used for Target Platform

7. Return to the phone's main screen — it prompts for the SIP Extension and SIP Password obtained above

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Provisioning via the Phone's Web GUI

Finding the Phone's IP Address

1. On the phone, log into Administration using the default credentials — 27238 (spells "craft")
2. Navigate to IP Configuration > Ethernet IPv4
3. Note the IP address listed under Phone

Accessing the Web GUI

1. From a browser on the same network, navigate to https://<phone IP address> using the IP address found above
2. Log in using the default credentials: username admin, password 27238 (spells "craft")
3. Change the password when prompted on first login

Configuring SIP Settings in the Web GUI

The same fields configured on the keypad are available in the web GUI's SIP section, typed or toggled directly rather than entered via the dial pad: SIP Domain, Registration Policy, Failback Policy, SIP Proxy Policy, the User ID Field toggle, and the resolved IP address under SIP Proxy List.

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Registration Interval

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Registering the Extension in CCaaS