How to manually insert the provision URL in a Linksys

You can set your IP phones to retrieve the provisioning URL automatically via DHCP 'option 66'. This is recommended for larger networks. For more information, see the DHCP option 66 configuration guide. This support was added in firmware versions 6.1.5a.

To provision Linksys SPA Phones please see the this guide: Provisioning a Linksys SPA 901, 921, 941, 922, 942, 962 for 3CX Phone System

SIP Phone Configuration Guides (Preferred)

SIP Phone Configuration Guides (Supported)

SIP Phone Configuration Guides (Tested)