Implementing subscriber-wide INAP service in VoIP switch

Intelligent Network Application Protocol allows telecom operators to differentiate themselves by providing value-added services in addition to the standard telecom services. In some telecom operators, switch-wide usage of INAP service causes interaction for tandem calls which need to be transited towards adjacent switch instead of INAP query. In this work, we share our experience and design solution approach for implementing subscriber-wide INAP service as an alternative to switch-wide usage.