Outgoingprocedures

Incomingprocedures

BCF

Call Service Function (CSF)

BIWF

SERVING NODE (SN)

Bearer Control Signalling

Bearer Control Signalling

Bearer

SCOPE OF THISRECOMMENDATION

Call Control Signalling(BICC protocol or

other signallingsystem)

Call Control Signalling(BICC protocol or

other signallingsystem)

Call Bearer Control (CBC)signalling

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBasic conceptSN types

ISN : provides the interface with non-BICC networks and terminal equipment

GSN : provides gateway functionality between two network domains

TSN : provides transit functionality between ISNs and GSNs

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBasic conceptSeparation between call and bearer

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalCourse ContentsOVERVIEWBICC protocol introductionSignal flow introductionExamples

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: Internal

Network model of BICC

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBICC protocol ModelSignalling Transport Layer : MTP3 for TDM NetworkSCTP over IP for IP networkSSLOP for ATM network

STC : Signalling Transport Converters. Mapping function according to underlying layers

Security Level: Internal

Signalling Transport Layers

BICC procedures

Bearer

Control

bearer control

protocol

generic

interface

transport specific

interface

call control

protocol

generic

interface

Signalling Transport Converter

Mapping

Function

bearer

specific

interface

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Confidential Information of Huawei. No Spreading without Permission.Security Level: Internal

Structure of the Protocol Stack

Used when there is no convert from TDM to IPUsed when there is convert

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBICC Message StructureCall Instance Code (CIC) is a logic number associated with the inter-office calling relation

Security Level: Internal

CIC

Message type code

Mandatory fixed part

Mandatory variable part

Optional part

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalFormat of BICC messagesCICis used to identify signalling relation between peer BICC entities and associate all the PDUs to that relation.

message type code

the mandatory fixed part

the mandatory variable part

the optional part, which may contain fixed length and variable length parameter fields

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBlocking and Unblocking of CIC

All outgoing non test calls are blocked using those CIC values

Incoming non test call with those CIC leads to error case

Incoming Test calls with those CIC values are permitted to be carried out

Outgoing test calls using those CIC values are also permitted

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalMain message of BICC protocol

IAMInitial address messageAPMApplication transport messageACMAddress complete messageANMAnswer message RELReleaseRLCRelease complete

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalCourse ContentsOVERVIEWH.248 protocol introductionSignal flowExamples

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel 3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBasic Call SetupForward Bearer SetupNo Tunnel caseFast Tunnel Delayed Forward Tunnel

Backward Bearer Setup No Tunnel CaseDelayed Backward Tunnel

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalForward Bearer SetupBearer setup is initiated in the forward direction of the call

CSF decides whether bearer setup will be in forward direction or in backward direction

CSF decides if tunnelling is supported. BCF decides if tunnelling is used

Tunnelling is carrying Bearer Control Info embedded in BICC messages

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel 3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalForward Establish Flow

Security Level: Internal

CSF

BCF-N

AAA

ANM

CSF

(y)

(z)

ACM

BICC

(x)

ANM

ACM

ISUP

APM (Action = Connect Forward, no notification) (BNC-ID=z1), (BIWF Addr=z)

BICC

ISUP

APM (Action = Connect Forward, no notification) (BNC-ID=y1), (BIWF Addr=y)

IAM (Action = Connect Forward), (BNC characteristics)

ISN-B

BCF-N

CSF-N

Bearer Set-up req. (BNC-ID=y1), (BIWF-Addr=y)

Bearer-Setup-Connect

COT

Bearer Set-up req. (BNC-ID=z1), (BIWF-Addr=z)

IAM (COT on previous), (Action = Connect Forward) , (BNC characteristics)

Bearer-Setup-Connect

IAM

BBB

ACM

ACM

ANM

ANM

BCF-N

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel 3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: Internal

Backward Establish Flow

Security Level: Internal

CSF-N

BCF-N

(x)

ANM

CSF-T

AAA

(y)

ACM

BICC

(z)

ANM

ISUP

ACM

ISUP

BICC

IAM (Action = Connect backward), (BNC-ID=x1), (BIWF-Addr=x) , (BNC characteristics)

BCF-N

Bearer-Setup-Connect

CSF-N

Bearer Set-up req. (BNC-ID=x1), (BIWF-Addr=x)

COT

Bearer Set-up req. (BNC-ID of BIWF y), (BIWF-Addr=y)

IAM (Action = Connect backward),

(COT on previous), (BNC-ID=y1), (BIWF-Addr=y) , (BNC characteristics)

Bearer-Setup-Connect

IAM

BBB

ACM

ACM

ANM

ANM

BCF-N

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalTunnelBearer Setup Messages (IPBCP) are sent embedded in BICC messages

Fast Tunnel : Tunnel data transferred in first IAM message

Security Level: Internal

1: Tunnel Info

5: APM (tunnel data)

2: IAM (tunnel data)

4: Tunnel Info

6: Tunnel Info

3: Tunnel Info

CSF

BCF

CSF

BCF

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalTunnel ContdForward Delayed Tunnel : Tunnel data not transferred in first IAM message or in first backward APM message , Starts from first forward direction APM message

Security Level: Internal

3: Tunnel Info

2: APM (tunnel data)

1: IAM (tunnel data)

6: Tunnel Info

8: Tunnel Info

5: Tunnel Info

CSF

BCF

CSF

BCF

4: APM (tunnel data)

7: APM (tunnel data)

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalTunnel contd

Backward Delayed Tunnel : Tunnel data not transferred in first IAM message , but starts from first APM message in backward direction

Security Level: Internal

6: Tunnel Info

4: APM (tunnel data)

1: IAM (tunnel data)

2: Tunnel Info

5: Tunnel Info

3: Tunnel Info

CSF

BCF

CSF

BCF

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalCodec NegotiationThe Supported Codec List is constructed and contains all the codecs, in priority order, that are offered for use in the call from the SN initiating codec negotiation.

Intermediate SN will delete the codecs from the received Supported Codec List which it cannot support and is passed to next SN

Terminating SN selects the codec with highest priority in the received Supported Codec List that can be supported by it. This is selected codec. This is passed to previous SN.

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalCodec Negotiation contd.

Security Level: Internal

CSF-N

BCF-N

(x)

ISN-A

ANM

CSF-T

AAA

(y)

TSN

ACM

BICC

APM (Action = Selected codec),

(Selected codec), (Available codec list)

APM (Action = Selected codec),

(Selected codec), (Available codec list)

(z)

ANM

ISUP

ACM

ISUP

BICC

IAM (Action = Connect backward), (Codec list)(BNC-ID=x1), (BIWF-Addr=x) , (BNC characteristics)

ISN-B

BCF-N

CSF-N

Bearer Set-up req. (BNC-ID=x1), (BIWF-Addr=x)

Bearer-Setup-Connect

Bearer Set-up req. (BNC-ID=y1), (BIWF-Addr=y)

IAM (Action = Connect backward), (Codec list)

(COT on previous), (BNC-ID=y1), (BIWF-Addr=y) , (BNC characteristics)

Bearer-Setup-Connect

IAM

ACM

ACM

ANM

ANM

BCF-N

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalChap3 signaling flow3.1 BICC bearer establish mode3.2 forward bearer establish3.3 backward bearer establish3.4 tunnel3.5 CODEC negotiation3.6 call release

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalReleaseCSF receiving REL, initiates bearer release towards the sender of REL if this CSF initiated bearer setup before and then sends back RLC

CSF sending REL to the other CSF, waits until it gets RLC and then initiates bearer release towards the sender of RLC, if this CSF initiated bearer setup before

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalRelease while forward bearer establishment

Security Level: Internal

CSF-N

BCF-N

Bearer release req.

ISN-A

ISUP

CSF-T

RLC

RLC

TSN

Bearer release Req.

BICC

BICC

Bearer release Ack.

ISN-B

BCF-N

CSF-N

RLC

ISUP

RLC

Bearer release Ack.

REL

REL

REL

REL

BCF-N

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalRelease while Backward bearer establishment

Security Level: Internal

CSF-N

BCF-N

Bearer release req.

ISN-A

ISUP

CSF-T

RLC

RLC

TSN

BICC

BICC

Bearer release Ack.

ISN-B

BCF-N

CSF-N

RLC

ISUP

Bearer release req.

RLC

Bearer release Ack.

REL

REL

REL

REL

BCF-N

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalCourse ContentsOVERVIEWH.248 protocol introductionSignal flowExamples

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalExample of call setup in caller MSC Server, Forward no tunnel case

Security Level: Internal

666

Bearer Establish Ack ( no tunneling, context id, termination id)

Info (context id/context id2, termination id)

Bearer Establish (MGW-ID2,no tunneling supported, send/receive, BNC id, BIWF addr)

Info (APM Ind, BIWF address succeeding MGW-ID)

APM(Connect forward, plus notification, BNC id, BIWF address,succeeding MGW-ID)

Setup Ack

IAM (connect forward, no tunneling control info IE is present, COT to be expected)

Setup (Forward, no tunnel, no MGW ID, Initiator)

STC

MGRM

BICC

CC

Info (MGW_ID1, MGW ID2)

Bearer Established

Bearer Prepare ( MGW-ID2, context id)

(when MGW-ID1 MGW-ID2execute internal connection)

Bearer Prepare Ack (context id, termination id, MGW-ID2 address)

Bearer Esstablish (context id2 termination id, MGW-ID2 address)

Bearer Establish (MGW-ID1,MGW-ID2 address)

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalExample of call setup in MSC Server contd.

Security Level: Internal

666

Continuity

STC

MGW_RM

BICC

CC

APM (Connected)

>

ANM

Connect Ack

Answer

Alerting

ACM

COT

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalFew CBC Methods used for Codec negotiation and codec modificationReserve Char to reserve the necessary resources for all specified bearer service characteristics or codecs.

Confirm Charto confirm one particular codec or one bearer service characteristics to be used and others resources if allocated previously to be released

Modify Charto change a codec or a bearer service characterstics

Security Level: Internal

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalBackward bearer setup with Codec Negotiation in caller MSC

Security Level: Internal

ANM

Answer

Alerting

ACM

Bearer Prepare Ack(no tunnel, termination id2, BNC id, BIWF addr)

Setup Ack

Bearer Prepare ( no tunnel support, codec list, send/receive, context id)

Info (context id, termination id1 )

IAM (connect forward, BIWF address, BNC id, no tunneling indication)

Setup (MGW-ID1,MGW-ID2, backward, no tunnel, codec list, initiator

STC

MGW_RM

BICC

CC

Info (selected codec, available codec list)

Info (context id, termination id2

APM (connect backward selected codec, available codec list)

Confirm Char Ack

Confirm Char(selected codec)

Continuity

COT

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Confidential Information of Huawei. No Spreading without Permission.Security Level: InternalRelease of CallOutgoing side while bearer setup was forward Incoming side while bearer setup was in the forward direction

Security Level: Internal

Release bearer

RLC

REL

Release

STC

Release Complete

BICC

CC

MGW_RM

Release bearer Ack

Termination Release Ack

Termination Release

RLC

REL

Bearer Released

Release

STC

Release Complete

BICC

CC

MGW_RM

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Confidential Information of Huawei. No Spreading without Permission.Security Level: Internal

Security Level: Internal

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**Definition and function:Call Control Signaling like setting up a call, tear down, negotiation of parametersProvides signaling independent of bearer technology and signal transport technologyBICC is Adaptation of ISUP as defined in the scope of Recommendation Q.1901 series

*CSF: Call Service Function, performs call control BCF: Bearer Control Function, performs bearer control functionSN: CSF with associated BCFCMN: CSF without any BCF associated

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