NEC Electra Elite IPK II Features And Specifications Manual page 559

Electra Elite IPK II
Codec
G.723
Note 1:
Note 2:
r Data calls (Modem Data) across the VoIP connection are only supported when G.711 uLaw
Codec is used.
r The IAD(8)-U( ) ETU contains a regular TCP/RTP/IP stack that can handle real time
media. The IAD card, from the network administration perspective, is an end-point on the IP
network.
r The IAD(8)-U( ) ETU with "IP CCH for NEAXI" application loaded uses Common Channel
Interoffice Signaling over IP networks. Currently, this protocol does not allow for
communications across networks where Network Address Translation (NAT) is performed.
r The audio quality of speech connections depend greatly on the available bandwidth
between the IAD(8)-U( ) ETUs in the data network. As the internet is an uncontrolled data
network compared to an Intranet, it is highly recommended to use this application in
Intranet WAN environment, with known (or controlled and assured) Quality of Service
(QoS).
If any of the networks where the IAD(8)-U( ) ETU is connected uses NAT for connecting
r
the voice calls (including firewall), It is recommended that you consult your network
provider/administrator and specifically request service for VoIP or real-time media support
on your networks.
r A static IP Address is required for each IAD(8)-U( ) ETU in the network.
This feature allows Point-to-Multipoint, peer-to-peer connections for calls through the IP
r
K-CCIS Network. If a call is transferred or forwarded to a different system in the Network,
the trunks in the transferring system are released and a new Point-to-Point connection is
established.
r When a call terminates back to the originating system due to call forwarding or transfer, the
intermediate trunks are not released until the call is completed by an answer at the called
party or until the call is forwarded to a different system (similar to the link-reconnect function
in TDM CCIS).
The CCH(4)-U10 ETU is not required to support this feature. It can be installed and used in
r
a system using traditional K-CCIS with point-to-point T1 lines allowing both IP (K-CCIS) to
NEAX (Point-to-Multipoint) and traditional K-CCIS to be used with the same system.
K-CCIS - IP with IAD
Receive
Transmit
Data
Data Rate
Rate
25 Kbps 25 Kbps
This includes the overheads of VoIP communication, including signaling.
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.
Time
Packetization
Between
Delay
Packets
30 ms 37.5 ms
Document Revision 1
Default Theoretical
Jitter Buffer Maximum
Delay MOS
2 datagrams 3.87
(60 ms)
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