Durafon UHF must be linked to a Durafon PRO base. And yes you can program each line on the PRO system to have each handset an extension.

Durafon PRO system is a Multi-Line, Expandable, Cordless Phone System. And yes you can program each line on the PRO system to have each handset an extension. You can also link up to 8 bases so you can have 32 independent lines/extensions.

Durafon-SIP is a multi-mode communications system delivers industry-leading range and durability while providing significantly lower CAPEX and OPEX compared to other SIP cordless phone solutions. It supports 10 handsets and 10 SIP accounts/extensions.