Patent ID: 7542556

Claim:
An apparatus, comprising: one or more application server components that serve to impose one or more charges for a call on a plurality of respective numbers associated with one or more parties of a plurality of parties to the call; and a serving call session control function server that comprises multiple profiles for the one or more parties to the call, wherein the serving call session control function server comprises multiple public user identities for the one or more parties to the call; wherein the multiple profiles comprise one profile for one party of the one or more parties, wherein the one profile comprises a plurality of public user identities of the multiple public user identities, wherein each public user identity of the plurality of public user identities comprises one or more numbers, wherein the one or more numbers comprise any of a phone number, email address, and digit string; wherein the serving call session control function server maintains a registration state for each public user identity of the plurality of public user identities of the one profile; wherein one application server component of the one or more application server components imposes one charge of the one or more charges on the one public user identity that comprises one number of the one or more numbers; wherein upon receipt of the call, the serving call session control function server employs the one profile to route the call to one or more application server components of the one or more application server components; wherein the call comprises a header of the call, wherein the header of the call comprises a called-party-number field and a calling-party-number field, wherein the header of the call comprises the one number, wherein the one number comprises any of a phone number, email address, and digit string within the called-party-number field or the calling-party-number field; wherein the one application server component and the serving call session control function server communicate via session initiation protocol (SIP); wherein the one application server component supports a P-Asserted-Identity header extension of the session initiation protocol; wherein upon receipt of a DEREGISTER message, the serving call session control function server serves to change to a deregistered state the registration state that corresponds to the one public user identity.