H3C XE 200 IP, Руководство по эксплуатации

Страница: 70 / 514

Operation Manual – Process Server Configuration
H3C XE 200/2000 IP PBX
Chapter 4 SIP Overview
4-8
The proxy server extracts the address of calling UA and sends it in the session request
to the called UA.
z
Simultaneous ringing of multiple callees
You can have one number associated with multiple telephones (terminals) and have
these telephones rung simultaneously when the number is called. (You need to
configure the same priority for all the terminals and disable the random selection
function at the same time. Refer to 1.4.1 “Enabling/Disabling Random Selection” in
Location Server Configuration Operation ” for details about random selection function.)
z
Ringing of multiple callees in turn
You can have one number associated with multiple telephones (terminals). When the
number is called, these telephones ring in turn according to their preferences; these
telephones will ring simultaneously if they share the same preference. (You need to
configure different priority values for the terminals, or configure the same priority for all
the terminals and enable the random selection function at the same time. Refer to 1.4.1
“Enabling/Disabling Random Selection” in Location Server Configuration Operation ” for
details about the random selection function.)
Note:
Only in the call-routed mode can the XE voice server support “simultaneous ringing of
multiple callees” and “ringing of multiple callees in turn”. While in the call-redirect mode,
the XE voice server will direct a call involving multiple callees to one phone.
z
Authentication, handling 401 (unauthorized) that contains challenges
After the SIP proxy server forwards the INVITE to the callee’s UA, it may receive a 401
if the callee’s UA requires authentication. It then forwards the 401 to the originating UA.
If the originating UA provides authentication information in the resubmitted INVITE, the
proxy server then forwards it to the callee’s UA for authentication.
z
Periodic connectivity check between SIP proxy server and LS
A SIP proxy server and an LS need to maintain the connection between them for
communication. To check connectivity, they periodically exchange messages.
z
Transport protocol selection
In communicating with other devices, the SIP proxy server uses two transport protocols:
TCP and UDP. Automatic selection between the two protocols is available.
z
Multiplexing over TCP connections
When multiple calls that use TCP are present to a next hop, the SIP proxy server can
multiplex them onto one TCP connection and will never request for closing the
connection.