This is a digital phone product which uses an existing phone line (like a PRI Trunk) with upgraded equipment, making phone lines compatible with the current technology.
Brand:Avaya
Type:Desk Phones
The Partner MLS-18D is built for the Partner telephone system. It’s a full-featured option, with an LCD display, a speakerphone, and 16 programmable buttons.
Partner MLS-18D Telephone (Avaya) User Guide