ITU-T Kaleidoscope Conference
Innovations in NGN
Distributed PBX gateways to
enable the Hosted Enterprise
Services architecture in a NGN
scenario
Alejandro Cadenas
Telefónica I+D
cadenas@tid.es
Geneva, 12-13 May 2008
FMC Evolution Objectives
Technology is access network agnostic …
… different devices reach same application
Service layer will not only know the device…
… it will also know about the subscriber
The convergent core will provide AAA, etc
The services become USER CENTRIC
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
2
Enterprise Networks: specific
Enterprises are the first to see the change
Enterprises demand last-minute technology
Ready to pay significant amounts of money…
… if the product means a clear advantage.
Enterprise usually purchases telecom equipment
so the change cannot be TOO disruptive.
However evolution is required to reach convergence
Enterprises are already
demanding convergence
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
3
Traditional telecom architecture
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
4
Options towards convergence
Centrex-based solution
Near-term issues due to purchased CPE
Integration of Network logic into PBX
PBX becomes a monolithic element
Vendor-specific interfaces and APIs from network
Integration issues with network, i.e. Presence
Integration of PBX into Network logic
Network services and capabilities fully obtained
Vendor-specific protocol adaptation required
PBX becomes an additional ACCESS NETWORK
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
5
Horizontal Service Layer
CONVERGENT SERVICE LAYER
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
6
Functionality and Protocols
EBG, Enterprise Business Gateway
SERVICES
Adapts PBX to CSTA standard
OBG , Operator Business Gateway
Single entry point to HES service layer
SIP SIMPLE and other Network protocols
Routing among EBGs and Network Apps
ECMA CSTAv3
IMS
OBG
EBG
PBX
CTI protocol, based on XML
EVENTS to Apps, SERVICES to PBX
EXT
OBG and EBG follow a hierarchical structure
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
7
Applications
Presence
Availability of fixed extensions sent to PS
Monitoring
Hosted Services get updated information (EVENTS)
3PCC
Hosted Services can control the PBX extensions
Intelligent Routing
Calls can be routed to available devices only
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
8
Signaling flow: Presence
Ext
PBX
EBG
OBG
Service
Application
Presence
Server
1. Call enters from PLMN/PSTN
through PRI connection
2. [Prop] Incoming call event
3. [CSTA] OfferedEvent
4. [CSTA] OfferedEvent
5. Service Logic
execution
6. [CSTA] AnswerCall
7. [CSTA] AnswerCall
8. [Prop] AnswerCall
9. Call is delivered to Ext.
10. [Prop] Established call event
11. [CSTA] EstablishedEvent
12. [CSTA] EstablishedEvent
13. [SIP] NOTIFY
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
9
Signaling flow: 3PCC
Ext
PBX
EBG
Service
Application
OBG
Presence
Server
1. User A is Busy on a ongoing call
2. Call enters from user B
through PRI connection
3. [Prop] Incoming call event
4. [CSTA] OfferedEvent
5. [CSTA] OfferedEvent
6. Service Logic:
Time ∈ Working Hours
7. [SIP] SUBSCRIBE
8. [SIP] NOTIFY “A(Fixed) is BUSY”
9. Service Logic:
Divert to A(mobile)
10. [CSTA] DeflectCall (MSISDN)
11. [CSTA] DeflectCall (MSISDN)
12. [Prop] DeflecttCall (MSISDN)
13. Call is sent to MSISDN
14. [Prop] DivertedEvent
15. [CSTA] DivertedEvent
16. [CSTA] DivertedEvent
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
10
Conclusions
An adaptation architecture is presented
Evolution of enterprise services to FMC
horizontal architecture
Architecture exports enterprise communication
capabilities to IMS operator network
Mobile and Fixed communications are
provided in a convergent way
Geneva, 12-13 May 2008
First ITU-T Kaleidoscope Conference – Innovations in NGN
11
ITU-T Kaleidoscope Conference
Innovations in NGN
Distributed PBX gateways to
enable the Hosted Enterprise
Services architecture in a NGN
scenario
Alejandro Cadenas
Telefónica I+D
cadenas@tid.es
Geneva, 12-13 May 2008