Role of DPC and OPC in SS7
DPC – Destination Point Code  (14 bit ó 16384 SPs)
Termination point of application transaction
Key information for routing within SS7 network
DPC is inserted by the originating MTP ”user”.
OPC – Originating Point Code  (14 bit)
Originating point of application transaction
The ”network indicator” in the  SIO octet  determines whether the DPC or OPC is an international, national, or network dependent SP identifier.
F
CK
SIF
SIO
LI
Control
F