NEC SL1000 Features And Specifications Manual page 437

ISSUE 2.0
Description
H.323 is an International Telecommunication Union (ITU) standard for Packet Based Multimedia
Communication Systems. The SL1000/SL1100 can use H.323 to connect to another SL1000/SL1100
system or a third-party product.
The feature set is limited. When using H.323, it is impossible to use the advanced networking features.
The SL1000/SL1100 Voice over IP Trunk - H.323 package sends the real-time voice over the
corporate LAN or WAN. The voice from the telephone is digitized and then put into frames to be sent
over a network using Internet Protocol.
The SL1000/SL1100 Voice over IP Trunk - H.323 package allows communication using standard H.
323 (Normal and Fast Start) Protocol and allows connectivity to any H.323 standards compliant voice
gateway and gatekeeper. This VoIPDB also allows Registration and Authentication Server (RAS)
support to register with an RAS Server and use Gatekeeper for dynamic call routing.
The VoIPDB - H.323 is an optional interface that can provide IP trunks and Tie Lines. It can operate in
the following modes:
• COI
• COID
• DID
• TLI
• DTI
Depending on the requirements and resource allocation in the LAN/WAN/Internet, the VoIPDB - H.323
can be configured to use any of the following voice compressions:
• G.729 Low bandwidth requirement is used on most Wide Area Network links.
• G.711 High bandwidth requirement is usually used on Local Area Networks.
• G.722 This codec is useful in fixed network, Voice over IP applications, where the required
bandwidth is typically not prohibitive.
• G.723 This codec is a ITU-T standard wide band speech codec. This is an extension of
recommendation G.721 adaptive differential pulse code modulation to 24 and 40 kbit/s for digital
circuit multiplication equipment application.
Conditions
• A maximum of 16 IP Trunks are supported in the SL1000/SL1100.
• Calling Party Name is not provided for outgoing calls on SIP trunks.
Default Settings
None
System Availability
Terminals
All Multiline Terminals
Features and Specifications Manual
SL1000/SL1100
IP Trunk - H.323
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