SPC (Signaling Point Code) is used in the context of the SS7 signaling network, which is responsible for the exchange of signaling messages between different SS7 network elements that exist in mobile networks. SS7 network elements such as RNCs, SGSNs, MSCs, HLRs, VLRs, Service Control Points (SCPs), Signaling Transfer Points (STPs).

SPC serves as the addressing mechanism for these network elements, allowing them to identify and route signaling messages to the correct destination within the SS7 network.

SPC works in layer 3 in SS7 protocol stack. Which is the M3UA layer in the IP-based protocol stack, or the MTP3 layer in MTP-based protocol stack.