ZyXEL P-2601HN-F1 User Guide - Page 192
SIP, Each ZyXEL Device is an individual SIP User Agent UA. To provide voice service
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Chapter 16 VoIP 16.9.2 SIP The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol that handles the setting up, altering and tearing down of voice and multimedia sessions over the Internet. SIP signaling is separate from the media for which it handles sessions. The media that is exchanged during the session can use a different path from that of the signaling. SIP handles telephone calls and can interface with traditional circuitswitched telephone networks. SIP Identities A SIP account uses an identity (sometimes referred to as a SIP address). A complete SIP identity is called a SIP URI (Uniform Resource Identifier). A SIP account's URI identifies the SIP account in a way similar to the way an e-mail address identifies an e-mail account. The format of a SIP identity is SIPNumber@SIP-Service-Domain. SIP Number The SIP number is the part of the SIP URI that comes before the "@" symbol. A SIP number can use letters like in an e-mail address ([email protected] for example) or numbers like a telephone number ([email protected] for example). SIP Service Domain The SIP service domain of the VoIP service provider is the domain name in a SIP URI. For example, if the SIP address is [email protected], then "VoIP-provider.com" is the SIP service domain. SIP Registration Each ZyXEL Device is an individual SIP User Agent (UA). To provide voice service, it has a public IP address for SIP and RTP protocols to communicate with other servers. A SIP user agent has to register with the SIP registrar and must provide information about the users it represents, as well as its current IP address (for the routing of incoming SIP requests). After successful registration, the SIP server knows that the users (identified by their dedicated SIP URIs) are represented by the UA, and knows the IP address to which the SIP requests and responses should be sent. 192 P-2601HN(L)-F1 Series User's Guide