NEC ELECTRA ELITE IPK II, Руководство пользователя

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Electra Elite IPK II Document Revision 4C
IP Station (MEGACO) – MG 16 2 - 539
Each voice call requires at least the specifications listed in the following table. This includes all the
overheads of VoIP communication, including signaling).

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.

The MG16 uses MEGACO (H.248) Protocol to provide telephony services between remote
stations through the IP Network. This is an IETF/ITU standards-based protocol.

Speech-connection audio quality depends greatly on the available bandwidth between the stations
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.

When connecting the voice calls across NAT/Firewall, consulting your network provider/
administrator to specifically request service for VoIP or real-time media support on your networks is
recommended.

A static IP Address is required for each MG16 in the network.

The MG16 ETU and Elite IPK II CPUII must be configured to communicate on the same network. This
may require a second static IP Address for the IPK II CPUII.

The MG16 supports station to station direct RTP connections (peer-to-peer) for calls between IP
Phones that provide the following benefits:

Improved voice quality for calls between two IP Phones.

Improved bandwidth performance for voice between IP Phones.

Pad and echo canceller controls are built-in and are programmable via Elite IPK II KSU Programming.

The LAN/WAN connection is provided by a 10
Base-T
/100 Base-TX Ethernet connector. This
connector is a single 10/100 MPS Ethernet Connector. This port has Auto-Medium Dependent Interface
Crossover (MDIX) to allow using either a straight-through Ethernet cable for connection to a PC or a
crossover Ethernet cable.

The Ethernet Interface setting allows manual configuration of the Ethernet port from the Key System
programming, and can be set to operate in the following port speed and duplex mode combinations:
10MB/Full Duplex, 10MB/HalfDuplex,100MB/Half Duplex, or 100MB/Full Duplex, Auto-Negotiate via
Elite IPK II KSU Programming.
Codec
Transmit
Data Rate
Receive
Data Rate
Time
Between
Packets
Packetization
Delay
Default Jitter
Buffer Delay
Theoretical
Maximum
MOS
G711

Law 90 Kbps 90 Kbps 20 ms

1.5 ms 2 datagrams
(40 ms)
4.4
G729 34 Kbps 34 Kbps 20 ms

15.0 ms 2 datagrams
(40 ms)
4.07

When an IP Soft Phone is connected, set Time Between Packets to 100 ms.