BELGACOM B-BOX, Инструкция по эксплуатации

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SIP, the Session Initiation Protocol, is a signaling protocol for Internet conferencing, telephony,
presence, events notification and instant messaging. The call waiting feature allows the user to
take an incoming call, even though the user is already on the phone. The user upon hearing the
new call, can put the original caller on hold and speak to the new caller. When the user hasn’t
finished talking to the new caller, he can resume his conversation with the original caller.
According to the SIP RFC, a proxy server is “An intermediary entity that acts as both a server
and a client for the purpose of making requests on behalf of other clients. A proxy server
primarily plays the role of routing, which means its job is to ensure that request is sent to another
entity ‘closer’ to the targeted user.”
The proxy server therefore, is an intermediate device that receives SIP requests from a client and
then forwards the requests on the client’s behalf. Proxy servers receive SIP messages and
forward them to the next SIP server in the network. A series of proxy and redirect servers receive
requests from a client and decide where to send these requests. Proxy servers can provide
functions such as authentication, authorization, network access control, routing, reliable request
retransmission, and security.
From the SIP RFC, “A registrar is a server that accepts REGISTER requests and places the
information it receives in those requests into the location service for the domain it handles.”
See the table below for a description of the parameters.
Parameter Description
SIP Listen Port It is strongly recommended that you to leave the SIP port unchanged (Default:
5060).
Support Call Enables or disables support for call waiting. Waiting (Default: Disabled)
Proxy Setting Set the proxy settings.
‰ Proxy IP: IP address of your proxy server. (From your Telephony provider.)
‰ Proxy Port: Port number of the proxy server. (From your Telephony provider.)
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