This industrial style, commercial grade desk no-dial desk phone with ringer can only receive calls. Ring bell requires a ring signal with a minimum of 24 Volts. ^^ Compatible with analog phone lines (PSTN, VOIP) that is FSK or DTMF. ^^ Telephone line powered (no external power is required).
Important: Ring bell requires 24-48 Volts ring signal to work properly. ^^ Easy to install. Includes telephone patch cable (10 feet). ^^ Ring bell volume of the base unit can be adjusted (low to high). The handset has a volume control (HI ^^ LO). ^^ Free technical support. If you need any help installing or operating this phone, please send us a message via. Our staff usually respond within 1-2 hours.