call forwarding basic conception and signaling flow introduction-20071022-b-1.0
TRANSCRIPT
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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.
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Thank You
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