NEC Univerge SV9100, Особенности и характеристики

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K-CCIS – IP
Description
The system uses the GPZ-IPLE daughter board to connect multiple systems together over a Data
Communication IP Network (Intranet). Key-Common Channel Interoffice Signaling (KCCIS) is used to
provide telephony services between the UNIVERGE SV9100 and another UNIVERGE SV9100 or a
NEAX PBX system.
CCIS Networking via IP (Non Peer to Peer Connections Basis).
IP trunk connections over CCIS Networking via IP can provide telephony services
to other SV9100’s
(or SV8100’s).
The UNIVERGE SV9100 uses the NEC proprietary CCIS Peer to Peer protocol over IP to
communicate between system to system.
The GPZ-IPLE is required for connections between IP terminals and IP trunks. Only one GPZ-IPLE
daughter board can be accommodated per system with a maximum of 128 DSP resources per system.
The GPZ-IPLE daughter board is an optional interface package for converting the Real Time Transfer
Protocol (RTP) packets on the IP network to PCM highway. IP telephones are required to be connected
directly to the IP bus. When IP telephones are required to be connected to conventional PCM based
digital circuit, the GPZ-IPLE converts IP packet signals. The GPZ-IPLE provides the digital signal
processors (DSPs) for IP stations and trunks.
A DSP provides format conversion from circuit switched networks (TDM) to packet switched networks
(IP). Each voice channel from the circuit switched network is compressed and packetized for
transmission over the packet network. In the reverse direction, each packet is buffered for de-jittering,
decompressed, and sent to the circuit switched network. Each DSP converts a single speech channel
from IP to TDM and vice versa.
The following are examples of DSP allocation:
Calling from IP telephone to a TDM telephone uses one DSP.
Calling from an IP telephone to another IP telephone that is registered to the same CPU uses no
DSPs.
Calling from a TDM telephone to a TDM telephone uses no DSPs.
Calling from a TDM telephone and out an IP trunk uses one DSP.
Calling from a TDM telephone across IP K-CCIS to another TDM telephone uses one DSP.
Calling from an IP telephone across IP K-CCIS to another IP telephone uses two DSP resources at
each location.
As stated earlier in this document, using Encryption (RTPs) or Packet Loss Recovery (PLR) can reduce
the number of available DSPs. Another thing that can reduce the amount of available DSPs is CODEC
choice.
Systems Requirements
Only voice (RTP/RTCP) processing functions are mounted among VoIP functions on the GPZ-IPLE. All
call control functions are handled by the GCD-CP10.
Only one GPZ-IPLE daughter board can be installed on the GCD-CP10.