Signaling System No. 7 (SS7/C7) - Protocol, Architecture and Services (Full Book)
     
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[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [X] [Y]

O (optional) part
     SCCP messages 2nd
O Abandon TDP
O Answer TDP
O Called Party Busy TDP
O Disconnect TDP
O Midcall TDP
O No Answer TDP
O Re-Answer TDP
O Suspend TDP
O Term Seized TDP
OBSCM
     in IN CS-1/AIN 0.1 2nd
     in IN CS-2/AIN 0.2
         PICs 2nd
         TDPs
         triggers 2nd 3rd 4th 5th
OBSCM (Originating Basic Call State Model)
OC (Optical Carrier) units
off-hook
on-hook
OPC (Originating Point Code)
OPC (Originating Point Code) parameter
OPDUs (Operational Protocol Data Units)
open transactions
operation and maintenance (MAP) 2nd
Operation Codes
operation codes (ANSI) 2nd 3rd
Optical Carrier (OC) units
optional fields
     ISUP messages 2nd
OR (Onward Routing)
Orig Null PIC
originating call half
     IN CS-1 2nd
Originating Point Code (OPC)
Originating Restrictions parameter (ANSI)
Originating Transaction IDs
origination
     call processing
Origination Attempt Authorized TDP
Origination Attempt TDP
OSS (Operations Support Subsystem)
overlap signaling 2nd
Overload message (ISUP)

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