This Supplement describes the additions required to support Service Provider Portability in a Signalling System Number No. 7 network for Number Portability Capability Set 1 (NPCS-1). The Portability Number Call Control for Service Provider Portability (PNCC-SPP) in a Signalling System Number No. 7 network provides the core function to support portability for geographic numbers using the onward routing and all call query methods.