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Sip components, Additional components – Siemens HIPATH 8000 User Manual

Page 36

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Technical Overview

36

SIP Components

SIP is a peer-to-peer protocol. The peers in a session are called user agents

(UAs).

SIP Clients

SIP clients include the following:

• Telephones — Act as UAS and UAC. The advance can initiate SIP re-

quests and respond to requests.

• Gateways — Provide call control. Gateways provide many services, the

most common being translation between SIP conferencing endpoints

of transmission format, communications procedures, and codecs.

Other functions include call setup and clearing on both the LAN side

and the switched-circuit network side.

SIP Servers

SIP servers include the following:

• Proxy servers — Receive SIP requests from a client and forward them

to the next SIP server in the network. Proxy servers can provide func-

tions such as authentication, authorization, network access control,

routing, reliable request retransmission, and security.

• Registrar servers — Process requests from UACs for registration of

their current location. Registrar servers are often colocated with redi-

rect or proxy servers.

Additional Components

• DHCP server

Distributes IP data and further information in a network automatically

(list of distributed information Æ page 175).

• SNTP server

Provides time, date, daylight saving and timezone information.

• Messaging server

For recording and reading messages.

• SNMP server

Logging and maintenance of network components.

• FTP server

For up- and download of files from and to the phone. These include

configuration files and music files.

• PC with internet browser

Enables the administration of the phone by using a Web Client such as

Internet Explorer.