NEC ELECTRA ELITE IPK II, Features And Specifications Manual

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Electra Elite IPK II Document Revision 1
IP Station (MEGACO) - MG 16 2 - 469
IP Station (MEGACO) - MG 16
The Media Gateway (MG16) is a IP Application loaded on the PVA( )-U( ) ETU. This is an optional
interface package for the Electra Elite IPK II system that supports MEGACO IP stations.
An on-board 10/100 Base-T connector provides a WAN/LAN connection. Voice and signaling data to/
from the IP stations are converted into IP Frames and transmitted through the Data Communication IP
Network Intranet or Internet. The Media Gateway 16 supports station-to-station direct RTP connections
(peer-to-peer) for calls between IP telephones. Each Media Gateway 16 application can support up to
16 TDM Talk paths. Although, one Media Gateway Card can support 256 IP Megaco Stations, but will
only provide 16 simultaneous talk paths across the TDM highway.
The MG Application contains a regular TCP/RTP/IP stack that can handle real-time media, supports
industry standard MEGACO (H.248) communication on the WAN side, and interfaces with the Electra
Elite IPK II.
For this feature, the Media Gateway 16 is installed and assigned as a VOIP MG16 ETU. Each Media
Gateway 16 supports IP signaling for up to 16 IP Phones and reduces the maximum capacity of IP
stations in the system by 16.
There can be only one Media Gateway Controller assigned in the Electra Elite IPK II. This determination
will be made in KSU Programming [84-05-03] Master/Slave determination. The "Media Gateway
Controller" performs the duties of interpreting UDP signaling messages between the Elite IPK II
Processor and IP Stations. Any additional MG16 ETUs added to the system will be known as Media
Gateway cards. The media gateway card controls and interprets RTP messaging from the IP Phone to
the Elite IPK II Processor.
If a non-System IP Phone (e.g., POT, System Phone), or trunk line is required, a DSP resource is
needed. If while on a peer-to-peer call, DSP resources are not utilized and the MG16 port is not
accessed, only Media Gateway Controller processing is utilized. If, while on a peer-to-peer call, a
conference call is formed, the peer-to-peer connection is released and a new non peer-to-peer
connection is created using the MG16 DSP resources - two ports will the utilized on the MG16 ETU. If
the third party drops out of the conversation, the call reverts to a peer-to-peer call.
A maximum of 16 PVA( )-U( ) ETUs can be installed supporting the maximum of 256 IP stations (refer to
Table 2-30 KSU Power-Based Calculator Chart on page 2-898 in the Universal Slots feature).
The MG supports only those vocoders that are approved to provide toll-quality speech path. The
following voice compression methods are supported for the IP Station (MEGACO) application:
J
G.711 uLaw - Highest Bandwidth
J
G.729 - Mid-Range Bandwidth