2N VoiceBlue Lite, Руководство пользователя

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2N - VoiceBlue Lite
5.2. SIP Components
SIP reports are transmitted between the following components:
•
UAC (User Agent Client) – a terminal Client that initiates SIP
signalling;
•
UAS (User Agent Server) – a terminal Server that responses to
SIP signalling from a UAC;
•
UA (User Agent) – a SIP network terminal (SIP telephone, or
gateway to other networks), contains a UAC and UAS;
•
Proxy server – receives connection requests from a UA and
transfers them to another Proxy server if the particular station
is beyond its control;
•
Redirect server – receives connection requests and sends them
back to the requester including destination data instead of
sending them to the calling party;
•
Location server – receives registration requests from the UA
and updates the terminal database with them.
All server sections (Proxy, Redirect, Location) are typically
available on a single physical machine called Proxy server, which
is responsible for client database maintenance, connection
establishing, maintenance and termination, and call directing.
The 2N - VoiceBlue Lite gateway is always a UA (has the same
functions as a VoIP telephone), i.e. receives call requests and
directs calls to GSM networks according to the internal LCR.
There are no SIP-defined server sections in the 2N - VoiceBlue
Lite gateway.
5.3. SIP Reports
Here is a list of main signalling reports sent in the SIP
environment:
•
INVITE – connection establishing request;
•
ACK – acknowledgement of INVITE by the final message
receiver;
•
BYE – connection termination;
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