Initial Detection Point (telephony)
The IDP receives a message initiated by the SSP and transmitted to the service control point SCP via the INAP protocol. The Service Switching Point receives a message initiated by the Calling Party, this could be an IAM. The SSP evaluates the nature of the message, in the case of the IAM the called and calling party numbers. From this it determines whether it can route the call or whether it needs further instructions. In this case if the SSP does require further instructions it sends an IDP to a service control point SCP via an IN protocol. The protocol may be INAP but could be CAMEL, or bespoke INAP flavours such as Ericsson INAP, Nokia INAP, Siemens INAP
or Huawei INAP.
