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4.2 System Configuration—Extensions
4.2.1 SIP (Session Initiation Protocol) Extension
Description
The Control Box supports the connection of SIP telephones. SIP extensions make and receive calls using
Internet Protocol (IP).
SIP Video Phone
Video phone calls can be established between SIP extensions with video phone capabilities.
Conditions
[General]
•
The Control Box supports SIP devices that use RFC 3261, 3264, 3310, 2327, or 4028.
•
Before a SIP extension can be used, the IP address of the main unit, password, and extension number
must be assigned on both the SIP extension and the Control Box.
For details on how to register, refer to the Installation Manual.
•
When registering the SIP extension, the user ID must be the extension number of the SIP extension.
•
DSP Resource Usage
Making a call from a SIP extension requires a certain number of DSP resources, depending on the codec
used. If all DSP resources are in use, this operation cannot be performed.
Installation Manual References
5.6 Registering IP Telephones
PC Programming Manual References
9.7 Control Box Configuration—[1-1] Configuration—Slot—V-SIPEXT128—Port Property
4.2.2 Peer-to-Peer (P2P) Connection
Description
The Control Box automatically establishes peer-to-peer communication between extensions. With peer-to-
peer calls, the call is routed directly from one SIP extension to another without going through the DSP card,
which means that P2P calls are established without using the Control Box's resources.
Conditions
•
Three codecs are used for peer-to-peer calls: G.722, G.711, and G.729A. The speech quality of the
codecs varies as follows: (High) G.722, G.711, G.729A (Low).
When the preferred codec of each party differs, the call will be established using the lower codec. For
example, if the caller prefers G.711 while the called party prefers G.729A, the call will be established
using G.729A.
•
The priority of the codec that will be used can be specified via the telephone itself.
•
For non-peer-to-peer calls via the DSP card, calls cannot be made or received when all of the card's
resources are being used.
•
The Control Box supports H.263/H.264 codecs for P2P video communication.
4.2 System Configuration—Extensions
Feature Manual
35
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