Structure Of Telephony Server; General; Tp And Sp For System Changeover - NEC UNIVERGE SV8500 Setup Manual

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)").
Each of IP devices/stations communicates with either of them (TP/SP) as registration destination. For in-
Note:
formation about it, refer to

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)
• SP (MPH): is always in ACT (changeover is not executed).
System #1 (STBY)
ACT
STBY
(for SIP Terminal)
System #0 (ACT)
(for SIP Terminal)
"SIP terminal" here refers to ones using SIP TERMINAL ACCOMMODATION [S-146] feature. For in-
Note 1:
formation about this feature, refer to the Data Programming Manual - Business.
"Registration Destination of IP
: operates simultaneously with ACT-side TP.
Note 1
TP
SP
SP
(MPH)
Note 1
TP
SP
SP
(MPH)
Note 1
Devices/Stations".
System #1 (ACT)
System
(for SIP Terminal)
Changeover
System #0 (STBY)
(for SIP Terminal)
– 3 –
CHAPTER 1 Introduction
TP
SP
SP
(MPH)
Note 1
TP
SP
SP
(MPH)
Note 1