Section: 5.3.4.4.3 Tracking of applications generating charging information
Content: Based on operator policy, each application for which the hosting AS CTF is generating charging events on its behalf, shall include the address or identifier of the AS as described in clause 5.3.4.4.2 and its application identifier into the initial SIP request to be sent out within the trust domain. The final SIP response sent back by the last element of the trust domain shall contain the list of addresses and application identifiers received within the initial SIP request. The list of addresses or identifiers and application identifiers received in the final response shall be included in the charging event generated by the CTF.