
53
Chapter 7 Voice
This chapter first describes the
SIP
and
Dial Plan
configuration screens. The
last section (
) describes how to use the VoIP (Voice over IP)
and PSTN (Public Switched Telephone Network) voice services.
7.1 SIP
Session Initiation Protocol (SIP) is a signaling protocol for Internet conferencing,
telephony, presence, events notification and instant messaging. It is the Internet
Engineering Task Force's (IETF's) standard for multimedia conferencing over IP.
It is designed to address the functions of signaling and session management
within a packet telephony network. Signaling allows call information to be carried
across network boundaries. Session management provides the ability to control
the attributes of an end-to-end call.
Session Initiation Protocol is a peer-to-peer protocol.
There are four components in the SIP standard:
(a) User Agents (
UA
) - SIP phone clients (hardware or software)
(b) Proxy Server – relays data between
UA
and external servers
(c) Registrar Server - a server that accepts register requests from
UA
(d) Redirect Server – provides an address lookup service to
UA
Содержание CT-820C
Страница 1: ...CT 820C VoIP Gateway User s Manual Version A2 0 December 26 2007 261053 034 ...
Страница 6: ...5 1 2 Application The following diagram depicts the application of the CT 820C ...
Страница 12: ...11 ...
Страница 19: ...18 4 4 ARP Click ARP to display the ARP information ...
Страница 20: ...19 4 5 DHCP Click DHCP to display the DHCP Leases information ...