Section: B.1 Voice Control
Content: To enable charging of ARP subscribers for voice calls, an online charging interface between the DSP and ARP is established. The concept of voice call shall be interpreted as any Circuit-switched call, whatever the teleservice used (speech, 3.1 kHz audio, Fax, or CS data) except circuit-switched Video Telephony calls (BS 37, 64 kbit/s unrestricted digital info mode). The voice control architecture is shown in figure B.1.1. Figure B.1.1: Voice Control Architecture and Associated Functions The signaling between the Visited Network and the DSP utilizes CAP for the online CS domain charging as specified in TS 32.250[ Telecommunication management; Charging management; Circuit Switched (CS) domain charging ]  [10]. For the CAMEL option of IF#1, the signaling between the DSP and ARP also utilizes CAP for the online CS domain charging as specified in TS 32.250[ Telecommunication management; Charging management; Circuit Switched (CS) domain charging ]  [10]. For the Diameter option of IF#1, the signaling between the DSP and ARP utilizes Diameter Ro for the Voice Call Service online charging as specified in TS 32.276[ Telecommunication management; Charging management; Voice Call Service (VCS) charging ]  [36] and utilizes the Proxy Function for mapping between CAMEL and Diameter as specified in TS 32.293[ Telecommunication management; Charging management; Proxy function ]  [56].