, 132??“133
establishing, 127??“135
modifying, 135
registration using SIP, 109??“127
terminating, 136
Session attribute lines, 84
Session Border Control, 15
Session control, 36
Session description parameter not
understood (warning), 83
Session Description Protocol (SDP),
60, 83??“86
level description, session, 84
media attribute lines, 85??“86
media description, 84??“85
in session establishment, 127??“129
time description, 84
Session hijacking, 154
Session identifier, 84
Session information, 84
Session Initiation Protocol (SIP),
57??“86
advantages of, 5, 57, 58, 60
as control protocol, 2??“3
development of, 4??“5
header fields, 69??“83
methods, 60??“64
requests, 64
responses, 65??“69
and SDP, 83??“86
structure of, 58??“60
total SIP networks, 54
Session level description, 84
Session name, 84
Session Progress (SIP response), 65
Session teardown, 140??“141
Session-based charging function,
166, 173??“174
Session-based event, 198
Session-based records, 173
SG (see Signaling gateway)
SGSN (see Serving GPRS
Support Node)
Short Message Service Center
(SMSC), 23
Short Messaging Service (SMS), 163
Signal transfer point (STP), 6, 40, 119
Signaling, 2, 36
amount of IMS, 38
backbone-network transport of, 30
and non-repudiation, 149
in VoIP, 50
Signaling gateway (SG), 20, 31??“32, 43
Signaling System #7 (SS7):
cause codes, 122??“125
in circuit-switched domains, 40??“42
core call control functions of, 8
database-connection/
communication function of, 41
defined, 2
development-to-implementation
of, 9
failures of, 27??“28
function of, 4
IMS interworking with, 118??“129
parameters of, 125??“127
setup/teardown-of-voice-circuits
function of, 41
SIP vs.
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