CFB Service Flow

For CFNA, CFB: 1) MSC sends LOCREQ (MDN_B) to HLR

HLR sends LOCREQRSP (MIN_B, No Answer Time) to MSC MSC Pages and after No Answer Time expires, It sends Transfer To Number Request (MIN_B) to HLR HLR returns TTN_RESP (Destination Number = MDN_C, Billing Number = MDN_B) MSC analyzes MDN_B and C. If B has authority to call C, then It sends LOCREQ (MDN_C) with calling party as MDN_A

For CFU, Switch Off: 1) MSC sends LOCREQ (MDN_B) to HLR

HLR sends LOCREQRSP (MIN_B, Redirection indicator = CFNA, Destination digits = MDN_C) MSC analyzes MDN_B and C. If B has authority to call C, then MSC sends LOCREQ (MDN_C) to HLR

MSC VLR

Origination system

a

b

c

d

e

f

h

g

Call origination

LOCREQ(DGTDIAL

HLR MSC

ROUTREQ(MIN)

ROUTREQ(MIN)

routreq (ACCDEN=Busy

Call forwarding

routreq (ACCDEN=Busy

locreq (TERMLIST,REDIND

MSC VLR

Origination system

a

b

c

d

e

f

h

g

Call origination

LOCREQ(DGTDIAL

HLR MSC

ROUTREQ(MIN)

ROUTREQ(MIN)

routreq (ACCDEN=Busy

Call forwarding

routreq (ACCDEN=Busy

locreq (TERMLIST,REDIND

1) CF, 2) CW 3) 3WC 4) MAH 5) FA 6) DND 7) CNIR 8) Emergency 9)

CNIR: In MAP message, the parameter Calling Party Number Digits has Nature of Number, which shows “Presentation Allowed/Restricted” In BSSAP? Preferred Language Indicator Switch OFF Not Reachable For CFB, whether MSC will page B party after getting Locresp? Call Waiting:

3-Way Calling: