Refurbished Phone Exchange Blog — Phones

  What is SIP?Session Initiation Protocol, commonly referred to as SIP, is a protocol commonly used in the voice over IP (VoIP) community. The session initiation protocol creates, maintains, and ends data transmission between two or more parties for an established data media stream of voice or video. What SIP does not do is transmit the media stream itself. SIP works in conjunction with another protocol such as real-time Transport Protocol (RTP) or Secure Real-time Transport Protocol (SRTP) to deliver the actual data. Why is SIP important?Why SIP is important is that SIP is the most common open standards protocol for establishing phone...

  Many modern desk phones now include a feature called a navigation key. This technology can be rephrased several different ways including menu driven display, menu key, and navigation cluster. The important part of the navigation key is that it allows you to navigate options on business phones that did not exist even 10 years ago.   The navigation keys are usually combined with a menu button that allow a user or telecom engineer to program some of the phone’s options directly through the handset. This prevents having to use the command line interface or web GUI or the phone...

The ShoreTel 230 and 230G are IP phones specially designed for the ShoreGear phone system. These phones operate on the MGCP protocol unlike most traditional SIP phones. Regardless, the phones are full of features such as a graphical display, full duplex speakerphone, and support for the G.722 HD audio codec.   As similar as the ShoreTel 230G is to the ShoreTel 230, they are not the same phone. The ShoreTel 230G is a Gigabit phone. What this means is that the integrated Ethernet switch on a ShoreTel 230G can transfer data at speeds up to 1 Gbps. This ‘Gig’ switch...

Adtran IP706 Phone Graphical LCD display (Backlit) 6 Programmable Buttons 6 Line/Call Appearances 10 Fixed Feature Keys 4 Soft Keys Full Duplex Speakerphone Integrated 10/100 Ethernet Switch Built-in Headset Port PoE SIP   Adtran IP712 Phone 12 Programmable Buttons 12 Line/Call Appearances Large Graphical LCD Display (Backlit) 4 Soft Keys 10 Fixed Feature Keys (mute, speakerphone, goodbye, message, etc...) Integrated 10/100 Ethernet Switch Built-in Headset Port PoE powered SIP

  ESI phones come in several variations, more than most other phone system brands. Luckily, all ESI part numbers include their features right in the part number. This makes it easy for us to know what a phone can do. DFP vs. IPFP – The Big Difference The largest difference when it comes to the newer ESI phones is DFP vs IPFP. DFP stands for Digital Feature Phone. DFP phones run over traditional RJ-11 phone cords and are used with ESI digital line cards. These phones are powered through the phone system and feature more traditional phone programming and set...