NEC SV8500, Setup Manual

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CHAPTER 1 Introduction
4. Structure of Telephony Server
4.1 General
This section explains the structure of Telephony Server, mainly about processors it has. Telephony Server has
TP and SP as processors on its CPU. Both TP and SP work together to provide various features. The following
are general description of TP and SP.
• TP : Telephony Processor, supports all the features provided in the system.
• SP : Signaling Processor, works as SIP server that handles call control signals using Session Initation
Protocol (SIP). SP consists of two parts - one for SIP terminals using a particular feature called
SIP TERMINAL ACCOMMODATION [S-146] (hereinafter called “SP (for SIP terminal)”), and
the other for other devices/stations using SP (hereinafter called “SP (MPH)”).
Note:
Each of IP devices/stations communicates with either of them (TP/SP) as registration destination. For in-
formation about it, refer to “
Registration Destination of IP Devices/Stations ”.
4.2 TP and SP for System Changeover
In dual configuration, each processor may stay in active (ACT) or stand-by (STBY) state. ACT-side processors
handle each operation while STBY-side processors prepare for system changeover. Their states change when
system changeover is performed. The relationship between system changeover and the state of each processor
(TP/SP) is described below.
• TP : changes its state (ACT/STBY) according to the state of the system to which the TP belongs.
• SP : operates differently between two parts of SP.
• SP (for SIP terminal)
Note 1
: operates simultaneously with ACT-side TP.
• SP (MPH): is always in ACT (changeover is not executed).
Note 1:
“SIP terminal” here refers to ones using SIP TERMINAL ACCOMMODATION [S-146] feature. For in-
formation about this feature, refer to the Data Programming Manual - Business.
TP
SP
Note 1
(for SIP Terminal)
(MPH)
SP
System #1 (STBY)
TP
TP
System #1 (ACT)
System #0 (ACT)
System #0 (STBY)
TP
ACT
System
Changeover
STBY
SP
Note 1
(for SIP Terminal)
SP
Note 1
(for SIP Terminal)
SP
Note 1
(for SIP Terminal)
(MPH)
SP
(MPH)
SP
(MPH)
SP