Zyxel IES-1000 EE [104/368] Sip identities

Zyxel IES-1000 EE [104/368] Sip identities
Chapter 17 VoIP
VOP1224-61 User’s Guide
104
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; see Section 17.1.2
on page 104) are represented by the UA, and knows the IP address to which the
SIP requests and responses should be sent.
Registration is initiated by the User Agent Client (UAC) running in the VoIP
gateway (the VOP). The gateway must be configured with information letting it
know where to send the REGISTER message, as well as the relevant user and
authorization data.
A SIP registration has a limited lifespan. The lifespan value is sent from the SIP
server to the UAC when the UAC first registers. The UAC must renew its
registration within this lifespan. If it does not do so, the registration data will be
deleted from the SIP registrar's database and the connection broken.
The VOP attempts to register all enabled subscriber ports when it is switched on.
When you enable a subscriber port that was previously disabled, the VOP attempts
to register the port immediately.
17.1.1.2 Authorization Requirements
SIP registrations (and subsequent SIP requests) require a username and
password for authorization. These credentials are validated via a challenge /
response system using the HTTP digest mechanism (as detailed in RFC3261, "SIP:
Session Initiation Protocol").
17.1.2 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 SIP-
Number@SIP-Service-Domain.
17.1.2.1 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 (johndoe@your-ITSP.com for
example) or numbers like a telephone number (1122334455@VoIP-provider.com
for example).

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