Ip Station (Megaco) - Iad (Integrated Access Device) - NEC Electra Elite IPK II Features And Specifications Manual

Document Revision 1
The IAD (8)-U( ) 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:
G.711 u Law - Highest Bandwidth
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G.729 - Mid-Range Bandwidth
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Each voice call requires at least the specifications listed in the following table. This includes all the
overheads of VoIP communication, including signaling).
Transmit
Codec
Data Rate
G711u Law 90 Kbps
G729 34 Kbps
* When an IP Soft Phone is connected, set Time Between Packets to 100 ms.
The IAD (8)-U( ) ETU contains a regular TCP/RTP/IP stack that can handle real time media. The
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IAD ETU is an end-point on the IP network from the network administration perspective.
The IAD (8)-U( ) ETU uses MEGACO (H.248) Protocol to provide telephony services between
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remote stations through the IP Network. This is an IETF/ITU standards-based protocol. Currently,
this protocol does not natively allow for communications across networks where Network Address
Translation (NAT) is performed.
Speech-connection audio quality depends greatly on the available bandwidth between the stations
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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 any network where the IAD (8)-U( ) ETU or any of its IP terminals is connected uses NAT for
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connecting the voice calls (including 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 IAD (8)-U( ) ETU in the network.
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The IAD (8)-U( ) ETU supports station to station direct RTP connections (peer-to-peer) for calls
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between IP Phones that provide the following benefits:
Improved voice quality for calls between two IP Phones.
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Improved bandwidth performance for voice between IP Phones.
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The operating mode can be configured per IAD (8)-U( ) ETU on each port.
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Pad and echo canceller controls are built-in and are programmable in the IAD (8)-U( ) ETU.
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The LAN/WAN connection is provided by a 10/100 Base-T Ethernet.
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Time
Receive
Between
Data Rate
Packets
90 Kbps 20 ms*
34 Kbps 20 ms*

IP Station (MEGACO) - IAD (Integrated Access Device)

Packetization Default Jitter
Delay Buffer Delay
1.5 ms 2 datagrams
(40 ms)
15.0 ms 2 datagrams
(40 ms)
Electra Elite IPK II
Theoretical
Maximum
MOS
4.4
4.07