Bearer Independent Call Control

1
Bearer Independent Call Control
- and its application of H.248 in public networks
ITU-T IP/MediaCom 2004 WorkshopApril 26, 2001
Presented by Greg Ratta (
), ITU-T SG 11 Vice-Chairman
2
Outline

• Introduction - What is BICC?
• BICC Architecture
• Overview of BICC Capability Set 1
• BICC Capability Set 2 and H.248
• Summary

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What is BICC?

• BICC provides a means of supporting narrowband
  ISDN services across a broadband backbone network
  without impacting the interfaces to the existing
  N-ISDN network and end-to-end services.
• The BICC call control signaling protocol is based
  on N-ISUP signaling
• The bearer control signaling protocols are based
  on different bearer technology control signaling
  protocols (e.g., DSS2 for AAL type 1 and AAL
  type 2)
• The BICC call control signaling protocol should
  not be aware of the actual bearer transport being
  employed. The binding information is used to
  reference the bearer.

4
BICC network architecture
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BICC Capability Set 1

• Forward and Backward Backbone Network
  Establishment
• Transport Call Control via MTP SS7 or ATM
• Support of most existing narrow band services.
• New Backbone Network Connection (BNC) with or
  without Codec Negotiation
• Reuse of Idle Backbone Network Connection (BNC)
• Separate Release of Call and Backbone Network
  Connection (BNC)
• Bearer Transport Types supported AAL 1 AAL 2

6
Forward bearer set-up and backward bearer set-up
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Early bearer call SETUP requestto improve
call set-up time
8
Additional confirmation of bearer CONNECT to
prevent speech clipping
9
Structure of the BICC standardization
documentation
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BICC Capability Set 2 and Beyond

• Extend BICC to the Local Exchanges
• Support IP Bearer, including Tunnelling
• Support of a Call Mediation Node Function
• Support Structured AAL1
• New Identifiers
• Traffic Group
• Global Call Reference
• Extend BICC to Special Resources Nodes (e.g.,
  announcement platformsetc)
• See list of features attached to this presentation

11
Functional architecture of the decomposed gateway
With BICC CS 1
ISN
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Functional architecture of the decomposed gateway
With BICC CS 2
RAS
X
Signalling
Termination
High Layer
SCN
H.245
SCN
D
C
X
B1
Z
Resource
Signalling
Signalling
Signalling
Control
Termination
Termination
Transport
Termination
B2
H.225.0
BICC CBC
X
Signalling
H.248
A
Termination
Packet and
Y
Z
Circuit
Decomposed ISN
Media
Termination
13
Network Topologies and Reference Points
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BICC CS 2 and Beyond

• Q.1902.1, BICC CS2 Functional Description
• Q.1902.2, BICC CS2 General functions of messages
  and signals
• Q.1902.3, Common Formats and Codes for BICC and
  ISUP
• Q.1902.4, BICC protocol elements
• Q.1902.5, Exceptions to APM in the context of
  BICC
• Q.19xx.1, Interworking between BICC and ISUP
• Q.19xx.2, Interworking between ISUP compatible
  signalling systems and the BICC protocol
• Q.19xx.3, Interworking between the H.225.0
  Multimedia Call Control protocol in an H.323
  network and the BICC protocol
• Q.19xx.4, Interworking DSS 2 to BICC
• Q.19xy, Interaction between the INAP protocol and
  the BICC protocol
• Q.ibcp, BICC IP Bearer Control Protocol
• Q.cbc, Call and Bearer Control Protocol
• Annex E to Q.1901, Signalling Transport
  Convergence for SCTP
• Supplements that document the signalling
  requirements

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Summary

• BICC CS 1 Standards were completed in 9 months
• BICC CS 2 uses H.248 in CBC interface
• All new services in ITU-T SG 11 to be specified
  for BICC before being added to ISUP or BISUP

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BICC Acronyms

• AAL ATM Adaptation Layer
• ACF Access Control Function
• ACN Access Concentration Node
• AESA ATM End System Address
• AGI Application Generated Identifier
• ANI Access Network Interface
• APM Application transport Message
• ATM Asynchronous Transfer Mode
• BCF Bearer Control Function
• BF Bearer Function
• BICC Bearer Independent Call Control
• BIWF Bearer Interworking Function
• BNC Backbone Network Connection
• CSF Call Service Function
• CSM Call State Model
• CMN Call Mediation Node
• B-ISUP Broadband ISUP
• DSS2 Digital Signalling System no.2
• GAT Generic Addressing and Transport protocol

• IN Intelligent Networks
• IP Internet Protocol
• ISDN Integrated Services Digital Network
• ISN Interface Serving Node
• ISUP ISDN User Part
• MTP3b Message Transfer Part no.3b
• NNI Network-Network Interface
• POP Point of Presence
• PSTN Public Switched Telephony Network
• SN Serving Node
• SPOI Signalling Point of Interconnection
• SS7 Signalling System no.7
• SSCOP Service-Specific Connection-Oriented
  Protocol
• STP Signalling Transfer Point
• SWN Switching Node
• TDM Time Division Multiplexing
• TE Terminal Equipment
• TG Trunk Group
• TSN Transit Serving Node