Abbreviations and Specialized Terms Alphabetical Reference
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SIP
Abbreviation for "Session Initiation Protocol".
Protocol standard for initialising calls in Æ IP networks.
SLK
Only for optiPoint 420 telephones. SLK (Self-Labeling-Key) means, that the
labeling fields of the function keys automatically display the stored func-
tions via LCD display.
VLAN
Abbreviation for "Virtual Local Area Network".
Subdivision of an Æ IP network into autonomous administration groups
(domains). A possibility of characterizing the association with a VLAN is us-
ing a Æ Default VLAN ID.
SNMP
Abbreviation for "Simple Network Management Protocol".
The protocol is used for communication with servers that takeover net-
work management functions. This includes for example, protocolling er-
rors that occur in network components (SNMPTrap).
SNTP
Abbreviation for "Simple Network Time Protocol".
The protocol is used between timeservers and terminal devices of a net-
work to synchronize the time of the terminal device.
SRSR
Abbreviation for "Small Remote Sites Redundancy".
SRTP/SRTCP
Abbreviation for "Secure Real Time Protocoll" or "Secure Real Time Contoll
Protocoll".
The SRTP protocol is a more secure version of the Æ RTP protocol and is
used in IP telephony for secure transmission of voice data between sta-
tions. The SRTCP protocol determines the QoS characteristics for received
streams. This provides senders with feedback that they can use to opti-
mize voice stream emission.
Subnet Mask
Classifies networks in A-, B- and C networks. Each class has a subnet
mask that demasks the relevant bits. 255.0.0.0 for Class A, 255.255.0.0 for
Class B and 255.255.255.0 for Class C. In a Class C network, for instance,
there are 254 Æ IP addresss.
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