What protocol does the TEO IP Phone use for assured services?

The TEO IP Phone uses the Session Initiation Protocol (SIP) for assured services due to SIP's design and capabilities in establishing, maintaining, and terminating real-time communication sessions such as voice and video calls over Internet Protocol (IP) networks. SIP is widely adopted because it enables multimedia communication and provides features like user location, session management, and flexibility for various communication applications.

SIP operates on a client-server model, enabling interaction between users and services effectively. This means that when a call is initiated, the SIP protocol handles the signaling part of the session, coordinating between different endpoints to set up and manage the call. This ensures that services can be delivered reliably, which aligns with the concept of assured services that the TEO IP Phone aims to provide.

While H.323 is another protocol that can be used for similar purposes, it is not as flexible or widely supported as SIP, particularly in environments that require interoperability with various multimedia services. RTP, on the other hand, is primarily focused on the transmission rather than the signaling of communication sessions, making it supportive in conjunction with SIP but not a standalone solution for assured services. Finally, Internet Protocol (IP) serves as the underlying network protocol that carries SIP and RTP messages but is not specific to