- •Contents
- •Foreword to the First Edition
- •Preface to the Third Edition
- •Preface to the Second Edition
- •Preface to the First Edition
- •1 SIP and the Internet
- •1.1 Signaling Protocols
- •1.2 Internet Multimedia Protocol Stack
- •1.2.1 Physical Layer
- •1.2.2 Data/Link Layer
- •1.2.3 Network Layer
- •1.2.4 Transport Layer
- •1.2.5 Application Layer
- •1.2.6 Utility Applications
- •1.2.7 Multicast
- •1.3 Internet Names
- •1.4 URLs, URIs, and URNs
- •1.5 Domain Name Service
- •1.5.1 DNS Resource Records
- •1.5.2 Address Resource Records (A or AAAA)
- •1.5.3 Service Resource Records (SRV)
- •1.5.4 Naming Authority Pointer Resource Records (NAPTR)
- •1.5.5 DNS Resolvers
- •1.6 Global Open Standards
- •1.7 Internet Standards Process
- •1.8 A Brief History of SIP
- •1.9 Conclusion
- •References
- •2 Introduction to SIP
- •2.1 A Simple Session Establishment Example
- •2.2 SIP Call with a Proxy Server
- •2.3 SIP Registration Example
- •2.4 SIP Presence and Instant Message Example
- •2.5 Message Transport
- •2.5.1 UDP Transport
- •2.5.2 TCP Transport
- •2.5.3 TLS Transport
- •2.5.4 SCTP Transport
- •2.6 Transport Protocol Selection
- •2.7 Conclusion
- •2.8 Questions
- •References
- •3 SIP Clients and Servers
- •3.1 SIP User Agents
- •3.2 Presence Agents
- •3.3 Back-to-Back User Agents
- •3.4 SIP Gateways
- •3.5 SIP Servers
- •3.5.1 Proxy Servers
- •3.5.2 Redirect Servers
- •3.5.3 Registrar Servers
- •3.6 Uniform Resource Indicators
- •3.7 Acknowledgment of Messages
- •3.8 Reliability
- •3.9 Multicast Support
- •3.10 Conclusion
- •3.11 Questions
- •References
- •4 SIP Request Messages
- •4.1 Methods
- •4.1.1 INVITE
- •4.1.2 REGISTER
- •4.1.5 CANCEL
- •4.1.6 OPTIONS
- •4.1.7 SUBSCRIBE
- •4.1.8 NOTIFY
- •4.1.9 PUBLISH
- •4.1.10 REFER
- •4.1.11 MESSAGE
- •4.1.12 INFO
- •4.1.13 PRACK
- •4.1.14 UPDATE
- •4.2 URI and URL Schemes Used by SIP
- •4.2.1 SIP and SIPS URIs
- •4.2.2 Telephone URLs
- •4.2.3 Presence and Instant Messaging URLs
- •4.3 Tags
- •4.4 Message Bodies
- •4.5 Conclusion
- •4.6 Questions
- •References
- •5 SIP Response Messages
- •5.1 Informational
- •5.1.1 100 Trying
- •5.1.2 180 Ringing
- •5.1.3 181 Call is Being Forwarded
- •5.1.4 182 Call Queued
- •5.1.5 183 Session Progress
- •5.2 Success
- •5.2.2 202 Accepted
- •5.3 Redirection
- •5.3.1 300 Multiple Choices
- •5.3.2 301 Moved Permanently
- •5.3.3 302 Moved Temporarily
- •5.3.4 305 Use Proxy
- •5.3.5 380 Alternative Service
- •5.4 Client Error
- •5.4.1 400 Bad Request
- •5.4.2 401 Unauthorized
- •5.4.3 402 Payment Required
- •5.4.4 403 Forbidden
- •5.4.5 404 Not Found
- •5.4.6 405 Method Not Allowed
- •5.4.7 406 Not Acceptable
- •5.4.8 407 Proxy Authentication Required
- •5.4.9 408 Request Timeout
- •5.4.11 410 Gone
- •5.4.12 411 Length Required
- •5.4.13 412 Conditional Request Failed
- •5.4.14 413 Request Entity Too Large
- •5.4.15 414 Request-URI Too Long
- •5.4.16 415 Unsupported Media Type
- •5.4.17 416 Unsupported URI Scheme
- •5.4.18 417 Unknown Resource Priority
- •5.4.19 420 Bad Extension
- •5.4.20 421 Extension Required
- •5.4.21 422 Session Timer Interval Too Small
- •5.4.22 423 Interval Too Brief
- •5.4.23 428 Use Identity Header
- •5.4.24 429 Provide Referror Identity
- •5.4.25 430 Flow Failed
- •5.4.26 433 Anonymity Disallowed
- •5.4.27 436 Bad Identity-Info Header
- •5.4.29 438 Invalid Identity Header
- •5.4.30 439 First Hop Lacks Outbound Support
- •5.4.31 440 Max-Breadth Exceeded
- •5.4.32 470 Consent Needed
- •5.4.33 480 Temporarily Unavailable
- •5.4.34 481 Dialog/Transaction Does Not Exist
- •5.4.35 482 Loop Detected
- •5.4.36 483 Too Many Hops
- •5.4.37 484 Address Incomplete
- •5.4.38 485 Ambiguous
- •5.4.39 486 Busy Here
- •5.4.40 487 Request Terminated
- •5.4.41 488 Not Acceptable Here
- •5.4.42 489 Bad Event
- •5.4.43 491 Request Pending
- •5.4.44 493 Request Undecipherable
- •5.4.45 494 Security Agreement Required
- •5.5 Server Error
- •5.5.1 500 Server Internal Error
- •5.5.2 501 Not Implemented
- •5.5.3 502 Bad Gateway
- •5.5.4 503 Service Unavailable
- •5.5.5 504 Gateway Timeout
- •5.5.6 505 Version Not Supported
- •5.5.7 513 Message Too Large
- •5.5.8 580 Preconditions Failure
- •5.6 Global Error
- •5.6.1 600 Busy Everywhere
- •5.6.2 603 Decline
- •5.6.3 604 Does Not Exist Anywhere
- •5.6.4 606 Not Acceptable
- •5.7 Questions
- •References
- •6 SIP Header Fields
- •6.1 Request and Response Header Fields
- •6.1.1 Accept
- •6.1.2 Accept-Encoding
- •6.1.3 Accept-Language
- •6.1.4 Alert-Info
- •6.1.5 Allow
- •6.1.6 Allow-Events
- •6.1.7 Answer-Mode
- •6.1.8 Call-ID
- •6.1.9 Contact
- •6.1.10 CSeq
- •6.1.11 Date
- •6.1.12 Encryption
- •6.1.13 Expires
- •6.1.14 From
- •6.1.15 History Info
- •6.1.16 Organization
- •6.1.17 Path
- •6.1.19 Record-Route
- •6.1.20 Recv-Info
- •6.1.21 Refer-Sub
- •6.1.22 Retry-After
- •6.1.23 Subject
- •6.1.24 Supported
- •6.1.25 Timestamp
- •6.1.27 User-Agent
- •6.2 Request Header Fields
- •6.2.1 Accept-Contact
- •6.2.2 Authorization
- •6.2.3 Call-Info
- •6.2.4 Event
- •6.2.5 Hide
- •6.2.6 Identity
- •6.2.7 Identity-Info
- •6.2.8 In-Reply-To
- •6.2.9 Info-Package
- •6.2.10 Join
- •6.2.11 Priority
- •6.2.12 Privacy
- •6.2.13 Proxy-Authorization
- •6.2.14 Proxy-Require
- •6.2.15 P-OSP-Auth-Token
- •6.2.16 P-Asserted-Identity
- •6.2.17 P-Preferred-Identity
- •6.2.18 Max-Breadth
- •6.2.19 Max-Forwards
- •6.2.20 Reason
- •6.2.21 Refer-To
- •6.2.22 Referred-By
- •6.2.23 Reply-To
- •6.2.24 Replaces
- •6.2.25 Reject-Contact
- •6.2.26 Request-Disposition
- •6.2.27 Require
- •6.2.28 Resource-Priority
- •6.2.29 Response-Key
- •6.2.30 Route
- •6.2.31 RAck
- •6.2.32 Security-Client
- •6.2.33 Security-Verify
- •6.2.34 Session-Expires
- •6.2.35 SIP-If-Match
- •6.2.36 Subscription-State
- •6.2.37 Suppress-If-Match
- •6.2.38 Target-Dialog
- •6.2.39 Trigger-Consent
- •6.3 Response Header Fields
- •6.3.1 Accept-Resource-Priority
- •6.3.2 Authentication-Info
- •6.3.3 Error-Info
- •6.3.4 Flow-Timer
- •6.3.5 Min-Expires
- •6.3.7 Permission-Missing
- •6.3.8 Proxy-Authenticate
- •6.3.9 Security-Server
- •6.3.10 Server
- •6.3.11 Service-Route
- •6.3.12 SIP-ETag
- •6.3.13 Unsupported
- •6.3.14 Warning
- •6.3.15 WWW-Authenticate
- •6.3.16 RSeq
- •6.4 Message Body Header Fields
- •6.4.1 Content-Encoding
- •6.4.2 Content-Disposition
- •6.4.3 Content-Language
- •6.4.4 Content-Length
- •6.4.5 Content-Type
- •6.4.6 MIME-Version
- •6.5 Questions
- •References
- •7 Wireless, Mobility, and IMS
- •7.1 IP Mobility
- •7.2 SIP Mobility
- •7.4 IMS Header Fields
- •7.5 Conclusion
- •7.6 Questions
- •References
- •8 Presence and Instant Messaging
- •8.1 Introduction
- •8.2 History of IM and Presence
- •8.3 SIMPLE
- •8.4 Presence with SIMPLE
- •8.4.1 SIP Events Framework
- •8.4.2 Presence Bodies
- •8.4.3 Resource Lists
- •8.4.4 Filtering
- •8.4.6 Partial Publication
- •8.4.7 Presence Documents Summary
- •8.5 Instant Messaging with SIMPLE
- •8.5.1 Page Mode Instant Messaging
- •8.5.4 Message Composition Indication
- •8.5.5 Multiple Recipient Messages
- •8.5.6 Session Mode Instant Messaging
- •8.6 Jabber
- •8.6.1 Standardization as Extensible Messaging and Presence Protocol
- •8.6.2 Interworking with SIMPLE
- •8.6.3 Jingle
- •8.6.4 Future Standardization of XMPP
- •8.7 Conclusion
- •8.8 Questions
- •References
- •9 Services in SIP
- •9.1 Gateway Services
- •9.2 SIP Trunking
- •9.3 SIP Service Examples
- •9.4 Voicemail
- •9.5 SIP Video
- •9.6 Facsimile
- •9.7 Conferencing
- •9.7.1 Focus
- •9.7.2 Mixer
- •9.8 Application Sequencing
- •9.9 Other SIP Service Architectures
- •9.9.1 Service Oriented Architecture
- •9.9.2 Servlets
- •9.9.3 Service Delivery Platform
- •9.10 Conclusion
- •9.11 Questions
- •References
- •10 Network Address Translation
- •10.1 Introduction to NAT
- •10.2 Advantages of NAT
- •10.3 Disadvantages of NAT
- •10.4 How NAT Works
- •10.5 Types of NAT
- •10.5.1 Endpoint Independent Mapping NAT
- •10.5.2 Address Dependent Mapping NAT
- •10.5.3 Address and Port Dependent Mapping NAT
- •10.5.4 Hairpinning Support
- •10.5.5 IP Address Pooling Options
- •10.5.6 Port Assignment Options
- •10.5.7 Mapping Refresh
- •10.5.8 Filtering Modes
- •10.6 NAT Mapping Examples
- •10.7 NATs and SIP
- •10.8 Properties of a Friendly NAT or How a NAT Should BEHAVE
- •10.9 STUN Protocol
- •10.10 UNSAF Requirements
- •10.11 SIP Problems with NAT
- •10.11.1 Symmetric SIP
- •10.11.2 Connection Reuse
- •10.11.3 SIP Outbound
- •10.12 Media NAT Traversal Solutions
- •10.12.1 Symmetric RTP
- •10.12.2 RTCP Attribute
- •10.12.3 Self-Fixing Approach
- •10.13 Hole Punching
- •10.14 TURN: Traversal Using Relays Around NAT
- •10.15 ICE: Interactive Connectivity Establishment
- •10.16 Conclusion
- •10.17 Questions
- •References
- •11 Related Protocols
- •11.1 PSTN Protocols
- •11.1.1 Circuit Associated Signaling
- •11.1.2 ISDN Signaling
- •11.1.3 ISUP Signaling
- •11.2 SIP for Telephones
- •11.3 Media Gateway Control Protocols
- •11.4.1 Introduction to H.323
- •11.4.2 Example of H.323
- •11.4.3 Versions
- •References
- •12 Media Transport
- •12.1 Real-Time Transport Protocol (RTP)
- •12.2 RTP Control Protocol (RTCP)
- •12.2.1 RTCP Reports
- •12.2.2 RTCP Extended Reports
- •12.3 Compression
- •12.4.1 Audio Codecs
- •12.4.2 Video Codecs
- •12.5 Conferencing
- •12.6 ToIP—Conversational Text
- •12.7 DTMF Transport
- •12.8 Questions
- •References
- •13 Negotiating Media Sessions
- •13.1 Session Description Protocol (SDP)
- •13.1.1 Protocol Version
- •13.1.2 Origin
- •13.1.3 Session Name and Information
- •13.1.5 E-Mail Address and Phone Number
- •13.1.6 Connection Data
- •13.1.7 Bandwidth
- •13.1.8 Time, Repeat Times, and Time Zones
- •13.1.9 Encryption Keys
- •13.1.10 Media Announcements
- •13.1.11 Attributes
- •13.2 SDP Extensions
- •13.3 The Offer Answer Model
- •13.3.1 Rules for Generating an Offer
- •13.3.2 Rules for Generating an Answer
- •13.3.3 Rules for Modifying a Session
- •13.3.4 Special Case—Call Hold
- •13.4 Static and Dynamic Payloads
- •13.5 SIP Offer Answer Exchanges
- •13.6 Conclusion
- •13.7 Questions
- •References
- •14 SIP Security
- •14.1 Basic Security Concepts
- •14.1.1 Encryption
- •14.1.2 Public Key Cryptography
- •14.1.4 Message Authentication
- •14.2 Threats
- •14.3 Security Protocols
- •14.3.1 IPSec
- •14.3.3 DNSSec
- •14.3.4 Secure MIME
- •14.4 SIP Security Model
- •14.4.1 SIP Digest Authentication
- •14.4.2 SIP Authentication Using TLS
- •14.4.3 Secure SIP
- •14.4.4 Identity
- •14.4.5 Enhanced SIP Identity
- •14.6 Media Security
- •14.6.1 Non-RTP Media
- •14.6.2 Secure RTP
- •14.6.3 Keying SRTP
- •14.6.4 Best Effort Encryption
- •14.6.5 ZRTP
- •14.7 Questions
- •References
- •15 Peer-to-Peer SIP
- •15.1 P2P Properties
- •15.2 P2P Properties of SIP
- •15.3 P2P Overlays
- •15.4 RELOAD
- •15.5 Host Identity Protocol
- •15.6 Conclusion
- •15.7 Questions
- •References
- •16 Call Flow Examples
- •16.1 SIP Call with Authentication, Proxies, and Record-Route
- •16.2 SIP Call with Stateless and Stateful Proxies with Called Party Busy
- •16.3 SIP to PSTN Call Through Gateways
- •16.4 PSTN to SIP Call Through a Gateway
- •16.5 Parallel Search
- •16.6 Call Setup with Two Proxies
- •16.7 SIP Presence and Instant Message Example
- •References
- •17 Future Directions
- •17.2 More Extensions
- •17.3 Better Identity
- •17.4 Interdomain SIP
- •17.5 Making Features Work Better
- •17.6 Emergency Calling
- •17.7 More SIP Trunking
- •17.9 Improved NAT Traversal
- •17.10 Security Deployment
- •17.11 Better Interoperability
- •References
- •A.1 ABNF Rules
- •A.2 Introduction to XML
- •References
- •About the Author
|
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Call Flow Examples |
363 |
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Via: SIP/2.0/UDP kings.cambridge.edu.uk:60000;branch=z9hG4bK2 Cancels search |
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Max-Forwards: 70 |
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From: J.C. Maxwell <sip:james.maxwell@kings.cambridge.edu.uk> |
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To: <sip:faraday@effect.org>;tag=6321 |
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Call-ID: mNjdwWjkBfWrd@7.9.18.12 |
CSeq not incremented |
|
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CSeq: 55 CANCEL |
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|
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Method set to CANCEL |
M14 |
SIP/2.0 200 OK |
CANCEL acknowledged |
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Via: SIP/2.0/UDP kings.cambridge.edu.uk:60000;branch=z9hG4bK2 |
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;received=7.9.18.12 |
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From: J.C. Maxwell <sip:james.maxwell@kings.cambridge.edu.uk> |
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;tag=5 |
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To: <sip:faraday@effect.org>;tag=6321 |
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Call-ID: mNjdwWjkBfWrd@7.9.18.12 |
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CSeq: 55 CANCEL |
|
M15 |
SIP/2.0 487 Request Terminated |
Final response to INVITE |
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Via: SIP/2.0/UDP kings.cambridge.edu.uk:60000;branch=z9hG4bK2 |
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;received=7.9.18.12 |
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From: J.C. Maxwell <sip:james.maxwell@kings.cambridge.edu.uk> |
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;tag=5 |
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To: <sip:faraday@effect.org>;tag=6321 |
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Call-ID: mNjdwWjkBfWrd@7.9.18.12 |
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CSeq: 55 INVITE |
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M16 |
ACK SIP/2.0 |
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Via: SIP/2.0/UDP kings.cambridge.edu.uk:60000;branch=z9hG4bK2 |
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From: J.C. Maxwell <sip:james.maxwell@kings.cambridge.edu.uk> |
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;tag=5 |
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To: <sip:faraday@effect.org>;tag=6321 |
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Call-ID: mNjdwWjkBfWrd@7.9.18.12 |
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CSeq: 55 ACK |
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16.6 Call Setup with Two Proxies
This section contains the complete message flow shown in Figure 2.2.
M1 INVITE sip:werner.heisenberg@munich.de SIP/2.0
Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a Max-Forwards: 70
To: Heisenberg <sip:werner.heisenberg@munich.de> From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 4827311-391-32934
CSeq: 1 INVITE
Subject: Where are you exactly? Contact: <sip:schroed5244@pc33.aol.com> Content-Type: application/sdp Content-Length: 159
v=0
o=schroed5244 2890844526 2890844526 IN IP4 100.101.102.103 s=Phone Call
t=0 0
c=IN IP4 100.101.102.103
364 |
SIP: Understanding the Session Initiation Protocol |
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m=audio 49170 RTP/AVP 0 |
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a=rtpmap:0 PCMU/8000 |
M2 |
INVITE sip:werner.heisenberg@200.201.202.203 SIP/2.0 |
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Via: SIP/2.0/UDP proxy.munich.de:5060;branch=z9hG4bK83842.1 |
|
|
Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a |
|
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Max-Forwards: 69 |
|
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To: Heisenberg <sip:werner.heisenberg@munich.de> |
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From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 |
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Call-ID: 4827311-391-32934 |
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CSeq: 1 INVITE |
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Contact: <sip:schroed5244@pc33.aol.com> |
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Content-Type: application/sdp |
|
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Content-Length: 159 |
|
|
v=0 |
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o=schroed5244 2890844526 2890844526 IN IP4 100.101.102.103 |
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s=Phone Call |
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c=IN IP4 100.101.102.103 |
|
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t=0 0 |
|
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m=audio 49172 RTP/AVP 0 |
|
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a=rtpmap:0 PCMU/8000 |
M3 |
SIP/2.0 180 Ringing |
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Via: SIP/2.0/UDP proxy.munich.de:5060;branch=z9hG4bK83842.1 |
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;received=100.101.102.105 |
|
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Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a |
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To: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 |
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From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 |
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Call-ID: 4827311-391-32934 |
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CSeq: 1 INVITE |
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Contact: <sip:werner.heisenberg@200.201.202.203> |
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Content-Length: 0 |
M4 |
SIP/2.0 180 Ringing |
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Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a |
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To: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 |
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From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 |
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Call-ID: 4827311-391-32934 |
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CSeq: 1 INVITE |
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Contact: <sip:werner.heisenberg@200.201.202.203> |
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Content-Length: 0 |
M5 |
SIP/2.0 200 OK |
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Via: SIP/2.0/UDP proxy.munich.de:5060;branch=z9hG4bK83842.1 |
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;received=100.101.102.105 |
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Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a |
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To: Heisenberg7 <sip:werner.heisenberg@munich.de>;tag=314159 |
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From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 |
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Call-ID: 4827311-391-32934 |
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CSeq: 1 INVITE |
|
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Contact: <sip:werner.heisenberg@200.201.202.203> |
|
|
Content-Type: application/sdp |
|
|
Content-Length: 159 |
v=0
o=heisenberg 2890844526 2890844526 IN IP4 200.201.202.203 s=Phone Call
c=IN IP4 200.201.202.203
Call Flow Examples |
365 |
t=0 0
m=audio 49172 RTP/AVP 0 a=rtpmap:0 PCMU/8000
M6 SIP/2.0 200 OK
Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKmp17a
To: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 4827311-391-32934
CSeq: 1 INVITE
Contact: sip:werner.heisenberg@200.201.202.203 Content-Type: application/sdp Content-Length: 159
v=0
o=heisenberg 2890844526 2890844526 IN IP4 200.201.202.203 c=IN IP4 200.201.202.203
t=0 0
m=audio 49170 RTP/AVP 0 a=rtpmap:0 PCMU/8000
M7 ACK sip:werner.heisenberg@200.201.202.203 SIP/2.0
Via: SIP/2.0/UDP 100.101.102.103:5060;branch=z9hG4bKka42 Max-Forwards: 70
To: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 From: E. Schroedinger <sip:schroed5244@aol.com>;tag=42 Call-ID: 4827311-391-32934
CSeq: 1 ACK Content-Length: 0
M8 BYE sip:schroed5244@pc33.aol.com SIP/2.0
Via: SIP/2.0/UDP 200.201.202.203:5060;branch=z9hG4bK4332 Max-Forwards: 70
To: E. Schroedinger <sip:schroed5244@aol.com>;tag=42
From: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 Call-ID: 4827311-391-32934
CSeq: 2000 BYE Content-Length: 0
M9 SIP/2.0 200 OK
Via: SIP/2.0/UDP 200.201.202.203:5060;branch=z9hG4bK4332 To: E. Schroedinger <sip:schroed5244@aol.com>;tag=42
From: Heisenberg <sip:werner.heisenberg@munich.de>;tag=314159 Call-ID: 4827311-391-32934
CSeq: 2000 BYE Content-Length: 0
16.7 SIP Presence and Instant Message Example
This section contains the call flow details of Figure 2.4.
M1 SUBSCRIBE sip:poisson@probability.org SIP/2.0 Via SIP/2.0/TCP lecturehall21.academy.ru:5060 ;branch=z9hG4bK348471123
Max-Forwards: 70
To: M. Poisson <sip:poisson@probability.org>
366 |
SIP: Understanding the Session Initiation Protocol |
From: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 Call-ID: 58dkfj34924lk34452k592520
CSeq: 3412 SUBSCRIBE Allow-Events: presence
Allow: ACK, INVITE, CANCEL, BYE, NOTIFY, SUBSCRIBE, MESSAGE Contact: <sip:pafnuty@lecturehall21.academy.ru;transport=tcp> Event: presence
Content-Length: 0
M2 SIP/2.0 200 OK
Via SIP/2.0/TCP lecturehall21.academy.ru:5060 ;branch=z9hG4bK348471123;received=19.34.3.1
To: M. Poisson <sip:poisson@probability.org>;tag=25140 From: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 Call-ID: 58dkfj34924lk34452k592520
CSeq: 3412 SUBSCRIBE Allow-Events: presence
Allow: ACK, INVITE, CANCEL, BYE, NOTIFY, SUBSCRIBE, MESSAGE Contact: <sip:s.possion@dist.probability.org;transport=tcp> Event: presence
Expires: 3600 Content-Length: 0
M3 NOTIFY sip:pafnuty@lecturehall21.academy.ru SIP/2.0 Via SIP/2.0/TCP dist.probablilty.org:5060
;branch=z9hG4bK4321 Max-Forwards: 70
To: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 From: M. Poisson <sip:poisson@probability.org>;tag=25140 Call-ID: 58dkfj34924lk34452k592520
CSeq: 1026 NOTIFY
Allow: ACK, INVITE, CANCEL, BYE, NOTIFY, SUBSCRIBE, MESSAGE Allow-Events: dialog
Contact: <sip:s.possion@dist.probability.org;transport=tcp> Subscription-State: active;expires=3600
Event: presence
Content-Type: application/pidf+xml Content-Length: 244
<?xml version=”1.0” encoding=”UTF-8”?> <presence xmlns=”urn:ietf:params:xml:ns:pidf”
entity=”sip:poisson@probability.org”> <tuple id=”452426775”>
<status>
<basic>closed</basic>
</status>
</tuple>
</presence>
M4 SIP/2.0 200 OK
Via SIP/2.0/TCP dist.probablilty.org:5060 ;branch=z9hG4bK4321;received=24.32.1.3
To: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 From: M. Poisson <sip:poisson@probability.org>;tag=25140 Call-ID: 58dkfj34924lk34452k592520
CSeq: 1026 NOTIFY
Content-Length: 0
Call Flow Examples |
367 |
M5 NOTIFY sip:pafnuty@lecturehall21.academy.ru SIP/2.0 Via SIP/2.0/TCP dist.probablilty.org:5060 ;branch=z9hG4bK334241
Max-Forwards: 70
To: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 From: M. Poisson <sip:poisson@probability.org>;tag=25140 Call-ID: 58dkfj34924lk34452k592520
CSeq: 1027 NOTIFY
Allow: ACK, INVITE, CANCEL, BYE, NOTIFY, SUBSCRIBE, MESSAGE Allow-Events: presence
Contact: <sip:s.possion@dist.probability.org;transport=tcp> Subscription-State: active;expires=1800
Event: presence
Content-Type: application/pidf+xml Content-Length: 325
<?xml version=”1.0” encoding=”UTF-8”?> <presence xmlns=”urn:ietf:params:xml:ns:pidf” entity=”sip:poisson@probability.org”>
<tuple id=”452426775”> <status> <basic>open</basic> </status>
<contact>sip:s.possion@dist.probability.org;transport=tcp
</contact>
</tuple>
</presence>
M6 SIP/2.0 200 OK
Via SIP/2.0/TCP dist.probablilty.org:5060 ;branch=z9hG4bK334241;received=24.32.1.3
To: P. L. Chebychev <sip:chebychev@academy.ru>;tag=21171 From: M. Poisson <sip:poisson@probability.org>;tag=25140 Call-ID: 58dkfj34924lk34452k592520
CSeq: 1027 NOTIFY
Content-Length: 0
M7 MESSAGE sip:s.possion@dist.probability.org SIP/2.0 Via SIP/2.0/TCP lecturehall21.academy.ru:5060 ;branch=z9hG4bK3gtr2
Max-Forwards: 70
To: M. Poisson <sip:s.possion@dist.probability.org>
From: P. L. Chebychev <sip:chebychev@academy.ru>;tag=4542 Call-ID: 9dkei93vjq1ei3
CSeq: 15 MESSAGE
Allow: ACK, INVITE, CANCEL, BYE, NOTIFY, SUBSCRIBE, MESSAGE Content-Type: text/plain
Content-Length: 9
Hi There!
M8 SIP/2.0 200 OK
Via SIP/2.0/TCP lecturehall21.academy.ru:5060 ;branch=z9hG4bK3gtr2;received=19.34.3.1
To: M. Poisson <sip:s.possion@dist.probability.org>;tag=2321 From: P. L. Chebychev <sip:chebychev@academy.ru>;tag=4542 Call-ID: 9dkei93vjq1ei3
CSeq: 15 MESSAGE
Content-Length: 0