Explanation
A SIP proxy server is a component of a SIP network that handles the setup and termination of calls between SIP devices. It also performs functions such as registration, authorization, network access control, and network security. Some of the functions of a SIP proxy server are:
Centralizes dial plans: A SIP proxy server can centralize the dial plans for a SIP network, meaning that it can translate and route calls based on a unified set of rules and policies. This simplifies the administration and management of the SIP network and ensures consistent call routing across different devices and locations.
Helps to centralize the administration and call control: A SIP proxy server can also help to centralize the administration and call control of a SIP network, meaning that it can provide a single point of contact and configuration for all the SIP devices and endpoints. This reduces the complexity and overhead of maintaining multiple SIP servers and devices and allows for easier monitoring and troubleshooting of the SIP network.
References:
1: What Is a SIP Proxy? How Does a SIP Server Work? - Nextiva
2: What is a SIP Proxy Server and How Does It Work? - ULTATEL Blog
3: What is SIP proxy? | Webopedia
4: Definition of SIP proxy | PCMag
5: All About SIP Proxy: What is a SIP Server? | TelNet Worldwide