strict, 130
P-CSCF role in, 12
of request, 130??“132
and VIA header, 82
Routing addresses, 13
Routing tables, 21, 163
RTP (Real Time Protocol), 60
Rtpmap (in media attribute line), 85
RTT (round trip time), 81
S
SCCP/TCAP layers, 32
SCP (see Service control point)
S-CSCF (see Serving Call Session
Control Function)
SCTP (Stream Control Transport
Protocol), 29
SDP (see Session Description
Protocol)
Sdplang (in media attribute line), 85
SDP-media-component AVP, 189, 195
SDP-media-description AVP, 189, 195
SDP-media-name AVP, 189, 195
SDP-session-description AVP, 189, 195
Secure ports, 108, 148
Security, 2, 137??“160
access, 150??“157
IMS, 142??“150
and IP domain threats, 138??“142
network domain, 157??“160
and P-CSCF, 12??“13
with SIP, 5
Security associations, 108, 148, 152,
153, 156??“157
Security methods, 142??“150
authentication/authorization,
143??“145
confidentiality encryption, 145??“146
denial-of-service prevention,
146??“147
integrity, 147??“148
non-repudiation, 149??“150
privacy, 148??“149
Security threats, 138??“142
amplification, 141??“142
denial-of-service attacks, 141
eavesdropping, 139
message body tampering, 140
registration hijacking, 139
server impersonation, 140
session teardown, 140??“141
SECURITY-CLIENT (SIP header),
111, 115
SECURITY-SERVER (SIP header),
116, 156
SECURITY-VERIFY
(SIP header), 116
Send and receive mode (in media
attribute line), 85
Sendrecv (in media attribute line), 85
Sequencing, 72
Served-party-IP-address AVP,
189, 195
SERVER (SIP header), 81
Server capabilities, 183, 185
Server failure responses, 67??“68
Server impersonation, 140
Server Internal Error (SIP
response), 67
Server Time-out (SIP response), 68
Server Unavailable
(SIP response), 68
Service assurance, 39
Service authorization, 144??“145
Service control point (SCP), 6, 27,
28, 119
Service delivery failures, 39
Service identifiers, 19, 102, 103
Service nodes, 174
220 Index
Service profiles, 101, 102, 109, 172
Service providers, 95
Service switching point (SSP), 119
Service-ID AVP, 189, 195
Service-information AVP, 189, 196
SERVICE-ROUTE (SIP header),
113, 114
Serving Call Session Control
Function (S-CSCF), 15??“16
access to ASs by, 16
assignment of, 112
authentication responsibility of,
12, 15
HSS storage of assignment for, 14
I-CSCF role in assignment of,
13??“14
information saved by, 15
and network domain security, 158
in registration process, 111??“118
as stateful proxy, 16
and user profile, 172??“173
Serving GPRS Support Node
(SGSN), 9, 24, 51, 52
Session(s):
accessing network for, 106??“109
in CONTENT-DISPOSITION
header, 71
description of, 195
dialog vs.
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