Patent ID: 8660245

Claim:
A method for providing advertising-supported call service in a session initiation protocol (SIP) communications network, the method comprising: receiving a SIP call setup message associated with a first call from a calling subscriber to a called subscriber; intercepting, at a node separate from a service control point (SCP), an initial detection point (IDP) message associated with the SIP call setup message, wherein the IDP message is sent in response to receiving, from a home location register (HLR), an insert subscriber data (ISD) message that includes a service key associated with a play advertisement pay less (PAPL) service, wherein the IDP message includes the service key; determining, using the IDP message, whether the calling subscriber subscribes to the PAPL service; and in response to determining that the calling subscriber subscribes to the PAPL service: presenting the advertisement to the calling subscriber via the subscriber's telephone; connecting the call to the called subscriber; and effecting a reduced charge for the call based on the PAPL service.