H.323 - SIP Interworking

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H.323 - SIP Interworking by Orit
Levin orit_at_radvision.com
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Two Directions

• Call signalling level interworking between and
  H.323 (and its architecture) and SIP (and its
  architecture)
• The definition of how Internet services (relevant
  for the task of call establishment over Internet)
  should be used in the context of H.323

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Internet services in the context of H.323

• Destination Address conventions (such as H.323
  URLs and phone numbers ENUM)
• DNS based Address Resolution Procedure
• Services Location using TRIP
• CPL
• Firewall and NAT environments

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Call Signaling Level Interworking

• Topology definition
• Supported services
• Supported data capabilities
• Protocols versions

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Call Signaling Level Interworking Topology
Definition

• Architecture should be defined in terms of
  protocol entities.
• H.323 Direct call vs. routed call model
• SIP Registrar, Redirect Server and Proxy
• Stateless/Statefull

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Call Signaling Level Interworking Supported
Services

• Basic IP-to-IP Call
• Conference calls
• Supplementary / CC services
• PSTN supporting scenario

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Call Signaling Level Interworking Supported
data capabilities

• Voice only
• Video
• FAX
• H.245/SDP
• Extensive capabilities exchange

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Call Signaling Level Interworking Protocols
versions

• H.323v2
• H.323v4
• Annexes
• SIP RFC2543
• Extensions