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SIP
Basics

SIP 
Foundation

SIP 
Advanced

SIP Basics

For Tier 1 Engineers, Sales and Managers

SIP Foundation

For Tier 2 Engineers and Technical Sales

SIP Advanced

For Tier 3 Engineers and Developers
Typical study time
~ 1 hour
~ 40 hours
~ 60 hours
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Foundation SIP
What is SIP?
SIP devices in the SIP network
Why SIP?
Simple Call analysis
SIP User Agents
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First SIP Call – 7 message call setup
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SIP requests and the request construct
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The request start-line
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Message body & media options
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Call-ID
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CSeq header and transactions
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Parsing payload: Content-Type & Content-Length
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Identifying caller and callee
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SIP responses
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Provisional responses
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100 Trying & reliable delivery
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Reliable delivery and request retransmissions
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Routing responses
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The 180 Ringing
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Other provisional responses
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Accepting the INVITE
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Success responses
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Final responses
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The INVITE transaction
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Negotiating media
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The ACK
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Subsequent requests
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Session establishment
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Terminating the session
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Error responses – rejecting a call
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Hold / off hold - the reINVITE
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Adding video to a voice call
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Cancelling a pending request
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The OPTIONS request - seeking capabilities
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OPTIONS as heart-beat
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SIP timers
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Registration and Location
The need for SIP servers
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SIP addresses
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SIP registration
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SIP location
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Registration expiry & re-registration
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Un-registration
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The REGISTER request
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Third party registration
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Proxy processing
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Request routing
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Location & contact resolution
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Routing responses
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Routing the ACK - route sets
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Stateful / stateless servers
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Multiple contact addresses
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Location & forking
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Q values
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Forking & branches
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To / From tags
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Dialogs, transactions & calls
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Dialog state
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Registration rejection
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Registration confirmation
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Routing
Inter-domain SIP location
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Routing subsequent requests
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Registration confirmation
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Forcing a route: the Route header
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Looping & spiralling
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Server failure responses - 5xx & 6xx
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Redirection
SIP redirection
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Redirection responses
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Recursion on redirection
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Redirection servers: subsequent responses & requests
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Security
Secure SIP
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Breach of security
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SIPS & routing
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Security realms
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Denial of service attacks
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Tunnelling encryption
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Extensibility & SIP services in deployed networks
Custom messages & headers
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The B2BUA
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Third party call control
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Interacting with the caller: the media/IVR server
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Mixing media streams: the media bridge
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Conferencing
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Conference features
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Video conferencing
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Quality of service - bandwidth managment
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IP PBX (include routing rules)
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IP PBX features
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The half-call model
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Session management & feature application
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Network borders - the access layer
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The IP multimedia subsystem (IMS)
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The SIP application server
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Voicemail
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Event notification - subscribe, notify & publish
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Least-cost routing
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Policy enforcement
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The administration layer
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Interop with the outside world
Interop with the PSTN – the PSTN gateway
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SIP trunks
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SIP over the public internet – the need for a session border controller (SBC)
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Media transcoding – the media gateway
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SIP & WebRTC
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SSC Certification
SIPsense Certified (SSC) exam & certification
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Topic of the week!
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SIP signalling packets are transmitted over the network in plain text. Is this safe from malicious, exploitative capture en-route?
How is SIP made secure? What the video to find out!
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