Yealink SIP-T28P

IP Phone Yealink SIP-T28P has all the advantages of other devices from Yealink’s product range: convenient handset, the optimal angle of the screen, high-definition audio that meets IEEE1329 standards, ten additional programmable keys to automate most common actions and LED status indication of contacts whose numbers are set to speed dial.

SIP-T28P can simultaneously connect up to independent SIP accounts; buttons with LED backlight allow you to quickly switch lines before dialing or directly during the conversation. As in the previous models, these buttons can be programmed along with ten programmable buttons on the right side of the phone.
Another distinctive feature of this model is the large backlit graphic display that simplifies interaction with the phone starting with the pre-configuration of network settings and finishing with function for everyday work.

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VoIP Favors SIP

Session Initiation Protocol (SIP) is a text-based standard put in place by the Internet Engineering Task Force (IETF) and is the primary protocol for Voice over Internet Protocol services. SIP is similar to a MGCP in that it's a signaling protocol that can create, maintain and terminate sessions in IP-based networks. These sessions include multimedia conferencing and two-way phone calls. SIP protocol can run on User Datagram Protocol (UDP), Stream Control Transmission Protocol (SCTP) and Transmission Control Protocol (TCP) because it was created to function independently from the underlying Transport Layer as an Application Layer.

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