Yealink explores Yealink's simplified explanations of common business communication terms regarding the application of three major communication devices, IP Phones, Video Conferencing Equipment and Headsets running on Microsoft, Zoom and other systems, in business work.

A SIP (Session Initiation Protocol) phone service is a Voice over Internet Protocol (VoIP) telephony system that uses the Session Initiation Protocol to manage and control multimedia communication sessions, including voice calls, video conferencing, and instant messaging. 

In simpler terms, a SIP phone service allows users to make and receive telephone calls over an IP network (like the internet) instead of using traditional Public Switched Telephone Network (PSTN). This type of service requires a SIP-enabled device or software application, often referred to as a SIP phone, softphone, or IP phone, which can establish connections with other SIP endpoints.

Key features of a SIP phone service include:

1. Cost Savings: Typically lower costs compared to traditional landlines due to VoIP's reliance on existing internet infrastructure.

2. Scalability: Easy to add or remove lines as your business needs change.

3. Flexibility: Calls can be made from anywhere with a stable internet connection, making it ideal for remote workforces and businesses with multiple locations.

4. Advanced Features: Often includes advanced call handling features such as voicemail-to-email, call forwarding, conference calling, and more without additional charges.

5. Integration: Can integrate well with other business tools and software platforms like CRM systems, unified communications solutions, and contact centers.

Users subscribe to a SIP service provider, which assigns them a unique SIP address (similar to a phone number), and then they can communicate with any other SIP user or even traditional phone numbers through SIP trunking or gateways.