Specifications

Product Overview

request to its destination, as the request URI always specifies the host which is essential.

The port and protocol are not always specified by the request URI. Thus if the request

does not specify a port or protocol, a default port or protocol is contacted. Using this

method may be the preferred measure when not using an application layer firewall,

application layer firewalls like to know what applications are flowing though which

ports and it is possible using content types of other applications other than the one you

are trying to let through which has been denied.

User agent server (UAS)

UAS is the server that hosts the application responsible for receiving SIP requests from a

UAC, and on reception returns a response to the request back to the UAC. The UAS

may issue multiple responses to the UAC, not necessarily a single response.

Communication between UAC and UAS is client/server and peer-to–peer.

Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but it

functions only as one or the other per transaction. Whether the endpoint functions as a

UAC or a UAS depends on the UA that initiates the request.

SIP IP Phone Models

This section introduces the SIP-T2xP IP phone family. SIP-T2xP IP phones are endpoints

in the overall network topology, which are designed to interoperate with other

compatible equipments including application servers, media servers,

internet-working gateways, voice bridges, and other endpoints. SIP-T2xP IP phones

are characterized by a large number of functions, which simplify business

communication with a high standard of security and can work seamlessly with a

large number of SIP PBXs.

SIP-T2xP IP phones provide a powerful and flexible IP communication solution for

Ethernet TCP/IP networks, delivering excellent voice quality. The high-resolution

graphic display supplies content in multiple languages for system status, call history

and directory access. SIP-T2xP IP phones also support advanced functionalities,

including LDAP, Busy Lamp Field, Sever Redundancy and Network Conference.

The following IP phone models are described:

 SIP-T28P

 SIP-T26P

 SIP-T22P

 SIP-T20P

SIP-T2xP IP phones comply with the SIP standard (RFC 3261), and they can only be used

within a network that supports this type of phone.

For successfully operating as SIP endpoints in your network, SIP-T2xP IP phones must

meet the following requirements: