Zyxel V301-T1 [102/240] Sip call progression

Zyxel V301-T1 [102/240] Sip call progression
Chapter 10 SIP Account Setup
V300 Series User’s Guide
102
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 circuit-
switched 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 SIP-
Number@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 (johndoe@your-ITSP.com for
example) or numbers like a telephone number (1122334455@VoIP-provider.com
for example).
SIP Service Domain
The SIP service domain of the VoIP service provider (the company that lets you
make phone calls over the Internet) is the domain name in a SIP URI. For
example, if the SIP address is 1122334455@VoIP-provider.com
, then “VoIP-
provider.com” is the SIP service domain.
SIP Call Progression
The following figure displays the basic steps in the setup and tear down of a SIP
call. A calls B.
1 A sends a SIP INVITE request to B. This message is an invitation for B to
participate in a SIP telephone call.
Table 26 SIP Call Progression
A B
1. INVITE
2. Ringing
3. OK
4. ACK
5.Dialogue (voice
traffic)
6. BYE
7. OK

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