Transcript Services in H.323, Protocol Update

Services in H.323
Protocol Update
VON Fall ‘99
IP Telephony
Datacom Networks and IP Services
Werner W. Eriksen
What’s new?
• Service Protocols
– More H.450.X supplementary services
– A new annex supporting open ended service control
• Http/XML based service presentation and control
• Service and User Mobility
– Virtual Home Environment (Tiphon)
September 1999
[email protected]
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New Services Based On H.450.X
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H.450.4 Call Hold
H.450.5 Call Park and Call Pickup
H.450.6 Call Waiting
H.450.7 Message Waiting Indication
H.450.8 Name Identification Service
H.450.9 Call Completion
– Busy Subscriber
– No Reply
• H.450.1 Signaling framework
• H.450.2 Call Transfer
• H.450.3 Call Diversion
September 1999
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Ex. H.450.6 Call Waiting
Terminal C
Terminal B
Setup
Alerting
callWaiting.invoke
User B is notified about the
incomming call from user C
User C waiting
Connect
User B releases call with
user A or places user A on
hold.
C active with B
September 1999
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H.450.X
• Standardized framework
• Requires that each new service is pushed through
the standardization process - takes time
• Presentation of service is left to the terminal vendor
– NOT the service provider
• …therefore...
September 1999
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… A new Annex has been added...
• To provide a more rapid approach for introduction of
new services. (beyond the classics)
• Allows intelligence both at endpoint and in the
network.
• Based on well known protocols
– HTTP, XML
• Standards based framework - not services
September 1999
[email protected]
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Proposed Changes to H.323 (Annex K)
• Add a URL to terminal registration phase
– Allows for non call related service control
• Add a URL in call setup messages for in-call
services
– Setup, Alerting, Connect, Info (IRQ), Facility
September 1999
[email protected]
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Ex. H.450.6 Call Waiting plus Http service control
End-user C
Terminal Browser
Terminal C
Terminal B
Web-server
Setup
Load(url)
Alerting (url)
callWaiting.invoke
GET url
Display
Http 200 OK (data)
I’m busy now, but you may:
1. Wait - it’s urgent,
2. Leave a message
GET url (I’ll wait)
Http 200 OK (data)
Notify B, its
urgent
Connect
September 1999
[email protected]
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Services based on the new Annex
• Allows a standard web browser to be used at the
endpoint for service control
• May be used for advanced call control
– as supplement to H.450.X services
• May be used for pushing commercials
• …new services...
September 1999
[email protected]
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Service and User mobility - requirements
• Users want to roam freely in VoIP networks
– want to be reached on same number when I travel from
Oslo to Atlanta
• Users wants to retain the same (supplementary)
service level when roaming in VoIP networks
– don’t want to loose my VPN dialing plans
September 1999
[email protected]
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Service and User mobility - concepts
• Virtual Home Environment (VHE) domain
– where a user “belongs”
• user and service profiles are stored here
• has authentication information
– Network services are executed here
– All call signaling going back to VHE
• Visited domain
– is where a user who is not at Home logs in
– relates to the VHE of user
• for user authenitication
• for service execution
September 1999
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Service and User mobility
Visited domain
Services
Home domain
Services
User Gatekeeper
User Gatekeeper
Network Gatekeeper
Network Gatekeeper
Terminal
Roaming user
September 1999
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H.323 now provides
• A suite of the traditional supplementary services
– Standardized on the H.450 framework
• A fast track for introduction of new services
– Without the need for standardization of each one
• A way to supply services for roaming users
– Work in progress...
September 1999
[email protected]
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