NEC Electra Elite IPK II System User Manual

Document Revision 4C Electra Elite IPK II
2 - 578 IP Trunk (SIP) – MG16
For this feature, the Media Gateway 16 is installed and assigned as a VoIP MG16 ETU. Each Media
Gateway supports IP signaling for up to 16 (SIP Trunks and/or SIP Stations) and reduces the maximum
capacity of SIP Trunk/Stations in accordance with the number of registered SIP Stations or SIP Trunks.
A maximum of 16 PVA(X)-U( ) ETUs can be installed supporting the maximum of 200 SIP Trunks (refer
to Table 2-44 KSU Power-Based Calculator Chart on page 2-1044 in the Universal Slots feature).
SIP Trunks can operate in two modes:
 SIP Trunking – provides connectivity to a SIP service provider.
 SIP Interconnect – provides connectivity to other IPK II systems.
Depending on the requirements and resource allocation in the LAN/WAN, the
SIP Trunk can be configured to use any of the following voice compressions:
 G.711 -Law – Highest Bandwidth
 G.729 (a) – Most often used
The minimum bandwidth requirements for each voice call is listed below. This includes all the overhead
of VoIP communication, including signaling.
 SIP signaling stack resides on the CPU II.
 The MG16 contains a regular TCP/RTP/IP stack that can handle real time media. The MG16 ETU
is an end-point on the IP network from the network administration perspective.
 Speech-connection audio quality depends entirely on the available bandwidth between the Voice
over IP end points in the data network. Because Internet is an uncontrolled data network compared
to an Intranet, using this application in Intranet WAN environment with known (or controlled and
assured) Quality of Service (QoS) is highly recommended.
 A static IP Address is required for each MG16 in the network.
Codec
Transmit
Data Rate
Receive
Data
Rate
Time
Between
Packets
Packetization
Delay
Default
Jitter Buffer
Delay
Theoretical
Maximum
MOS
G.711
-Law
90 Kbps 90Kbps 20 ms 1.5 ms 2 datagrams
(40 ms)
4.4
G.729 34 Kbps 34 Kbps 20 ms 15.0 ms 2 datagrams
(40 ms)
4.07
Note 1: This includes the overhead of VoIP communication, including signaling.
Note 2: In voice communications, particularly Internet telephony, the mean opinion score (MOS)
provides a numerical measure of the quality of human speech at the destination end of the
circuit. The scheme uses subjective tests (opinionated scores) that are mathematically
averaged to obtain a quantitative indicator of the system performance. The maximum for
the Mean Opinion Score is 5.0.

NEC Electra Elite IPK II System Specifications

General

Brand	NEC
Model	Electra Elite IPK II System
Category	Telephone System
Language	English