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SIP – H.323 Comparison
H.323 SIP
Architecture stack element
Origin ITU IETF
Conference control yes no
Protocol mostly TCP mostly UDP
Encoding ASN.1, Q.931 HTTPish
Emphasis telephony multimedia, multicast, events
Address flat alias, E.164, email SIP, E.164 URLs
Both SIP and H.323 are evolving: SIP additions, H.323v2 implemented, v3 to
be decided.
- 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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