Call Forwarding Basic Conception and Signaling Flow Introduction-20071022-B-1.0

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OWG000018 call forwarding basic conception and

signaling flow introduction

ISSUE 1.0

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Know the basic conception of call forward

Know classification of call forward

Master the call forwarding signaling flow

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ReferenceReference

GSM 03.82

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Chapter 1 Call forwarding classificationChapter 1 Call forwarding classification

Chapter 2 Call forwarding signaling flow

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Call forwarding classification Call forwarding classification

CFU: Call forwarding unconditional

CFB: Call forwarding on mobile subscriber busy

User Determined User Busy

Network Determined User Busy

CFNRy: Call forwarding on no reply

CFNRc: Call forwarding on mobile subscriber not reachable

Call re-routed from HLR

Call re-routed from VLR

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Questions

How many types of call forward?

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Chapter 1 Call forwarding classification

Chapter 2 Call forwarding signaling flowChapter 2 Call forwarding signaling flow

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Chapter 2 Call forwarding signaling flowChapter 2 Call forwarding signaling flow

2.1 CFU

2.2 CFB

2.3 CFNRy

2.4 CFNRc

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CFU

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Notes

OR1: Forwarding requested

OR2: Notification to calling subscriber required

LE: Local Exchange

SC: Service Centre (used for SMS)

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Chapter 2 Call forwarding signaling flowChapter 2 Call forwarding signaling flow

2.1 CFU

2.2 CFB

2.3 CFNRy

2.4 CFNRc

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CFB-Network Determined User Busy

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CFB- User Determined User Busy

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Notes

NDUB: Network Determined User Busy

UDUB: User Determined User Busy

OR1: Call to be forwarded

OR2: Notification to forwarding subscriber required

OR3: Notification to calling subscriber required

LE: Local Exchange

SC: Service Centre (used for SMS)

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Chapter 2 Call forwarding signaling flowChapter 2 Call forwarding signaling flow

2.1 CFU

2.2 CFB

2.3 CFNRy

2.4 CFNRc

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CFNRy

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Correlative glossary introduction

OR1: Call to be forwarded

OR2: Notification to forwarding subscriber required

OR3: Notification to calling subscriber required

LE: Local Exchange

SC: Service Centre (used for SMS)

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Chapter 2 Call forwarding signaling flowChapter 2 Call forwarding signaling flow

2.1 CFU

2.2 CFB

2.3 CFNRy

2.4 CFNRc

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Call re-routed from VLR

Cause reason： No paging response

Radio congestion

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Call re-routed from VLR- No paging response

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Call re-routed from VLR- Radio congestion

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Call re-routed from HLR

Cause reason： The mobile subscriber is deregistered or purged in the HLR

VLR can not provide roaming number

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Call re-routed from HLR- user deregistered in HLR

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Call re-routed from HLR- VLR can not provide roaming number

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Notes

OR1: Call to be forwarded

OR2: Notification to calling subscriber required

LE: Local Exchange

SC: Service Centre (used for SMS)

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Questions

In which condition the CFU 、 CFB 、 CFNRy 、 CFNRc will happen?

Please describe the CFU 、 CFB 、 CFNRy 、 CFNRc signaling flow.

Thank You

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