Example

ISP having P=2001:db8::/32 provides
VoIP service            P:1000::/40
streaming service       P:2000::/40
Internet connectivity   P:f000::/40
ISP controls
SLA: for traffic within P:1000::/40
Bandwidth: for traffic within P:2000::/40

Customer-A (with VoIP and Internet connectivity contract) uses
P:1000:1::/64 for VoIP communication
P:f000:2::/64 for Internet connectivity