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103
“Active Phone Networks”
language:
don’t want Turing-complete language
fail safe: make phone calls even if crashes
predictable resource consumption
hide parallelism (searches)
hide timers
execute in callee’s proxy server or end system (or phone button)
➠ CPL, an XML-based language
- Henning Schulzrinne 1
- Columbia University, New York 1
- SIP Basics 3
- SIP features 5
- SIP servers and clients 6
- Internet 7
- SIP architecture: carrier 9
- SLP?, TRIP−GW? 10
- SIP: basic operation 12
- SIP–DNS interaction 13
- SIP operation in proxy mode 14
- Basic SIP call 16
- 100 Trying 17
- 180 Ringing 17
- SIP – more detail 18
- Invitation modes 19
- Proxy and redirect servers 20
- SIP requests and responses 21
- SIP protocol request 22
- SIP requests 23
- SIP URLs 24
- SIP Protocol Design 25
- SIP protocol design 26
- “Internet binary” 28
- Jini/RMI, Corba, DCOM 28
- Protocol design: ASN.1 30
- Protocol design: textual 31
- RPC: RMI, Corba, DCOM 32
- Summary: SIP and Corba 33
- SIP Details 34
- SIP syntax 35
- SIP methods 37
- SIP response codes 38
- To: logical call destination 41
- From: call source 41
- CSeq: request within call leg 41
- Tagging To 42
- SIP request routing 43
- SIP response routing 44
- Via header before forwarding 45
- Expires limits search time 45
- Forcing request paths 47
- Record-Route and Route 48
- Call and caller identification 51
- Content description 52
- SIP message size 53
- SIP extensions: new methods 55
- SIP headers 56
- Inquiring about capabilities 58
- SIP reliability: INVITE 60
- SIP state transition – server 61
- SIP state transition – client 62
- SIP Registration and User 65
- Location 65
- REGISTER 66
- REGISTER example 67
- User requests contact list 68
- SIP message body 71
- Session description: SDP 73
- Security 77
- SIP authentication 78
- Basic authentication 79
- Digest authentication 80
- PGP authentication 82
- PGP encryption 84
- Anonymous calls 85
- SIP billing/charging 89
- SIP Caller Preferences 90
- Preferences 91
- Extended SIP Contact header 92
- Contact example 93
- Request-Disposition 95
- SIP Protocol Status and 96
- Implementations 96
- SIP implementations 98
- On-going SIP Implementations 99
- SIP server implementation 102
- “Active Phone Networks” 103
- CPL example 104
- Internet phone “appliance” 105
- Columbia e*phone 106
- SIP Services 108
- SIP services 109
- Signaling event notification 110
- SIP “fan-out” 111
- Branching requests 112
- Parallel search with CANCEL 113
- INVITE [email protected] 114
- IN call forwarding features 115
- IN call handling features 116
- SIP advanced services 117
- Building advanced services 118
- URL = conference-id@mcu-host 120
- Replaces =“inverse”Also 123
- SIP user location 124
- Camp-on service 128
- Outgoing call handling 129
- SIP and H.323 131
- SIP – H.323 Comparison 132
- SIP and H.323 elements 133
- H.323 Resource Reservation 134
- SIP vs. H.323: Call Setup 135
- CALL PROCEEDING 136
- ALERTING 136
- Services 137
- H.323 vs. SIP: Manageability 141
- H.323 vs. SIP: Scalability 142
- H.323 vs. SIP: Flexibility 143
- Mobility Support Using SIP 144
- Overview 145
- Mobility in an IP environment 146
- Terminal mobility 147
- Personal mobility 149
- Visiting a remote network 151
- Hotel California 152
- Getting home services 153
- Service mobility 154
- SIP Mobility Overview 162
- SIP mobility: pre-call 163
- SIP Mobility: Mid-call 164
- BS serves as default router 166
- Handoff Performance 168
- Open Issues 169
- Conclusion 170
- Programming SIP Services 171
- Programming SIP services 172
- Programming services 173
- Perl, Tcl, VB scripts 174
- Examples 175
- Cgi Example: Call Forwarding 178
- The Call Processing Language 180
- Features: 181
- Safe to run in servers 181
- Abstract structure 182
- Abstract structure (cont) 183
- Textual representation 184
- Switch nodes 187
- Address Switches: address 188
- String Switches: string 189
- Time switches: time 190
- Time switches: examples 191
- Location nodes 193
- Location lookup nodes: lookup 195
- Signalling Actions: proxy 197
- Signalling Actions: redirect 198
- Signalling Actions: reject 199
- Non-signalling action: mail 200
- Non-signalling action: log 201
- Subactions 202
- Example: Call Screening 205
- Example: Time-of-day Routing 206
- Example: Non-call Actions 207
- SIP Future 208
- What is SIP good at? 209
- What is SIP not meant for? 210
- SIP and Corba 211
- Current SIP efforts 212
- Other SIP Uses 213
- Summary and Conclusion 215
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