Variable that contains the state of the call component, in accordance with the Q.931 standard, of the first B channel of the line (basic ISDN access) determined by the index. The possible values are: (0) Null state. (No call). (1) Call started. (The user request for the call setup to the network. For outgoing calls). (2) Overlapped dispatch. (The user has received the ack of the call setup request that allows the user to send extra information about the call to the network in an overlapped way. For outgoing calls). (3) Outgoing call under way. (The user has received the ack that contains that the network has received all the call information necessary to perform the call setup. For outgoing calls). (4) Delivered call. (The caller receive the indication that the other end user has started the announcement. For outgoing calls). (6) Present call. (The user has received a call setup request but a response hasn�t been generated yet. For incoming calls). (7) Received call. (The user has indicated the announcement but hasn�t answered yet. For incoming calls). (8) Connection request. (The user has answered the call and is waiting for the call assignation. For incoming calls). (9) Incoming call under way. (The user has acknowledged the receipt of the call information necessary to perform the call setup. For incoming calls). (10) Active. (For incoming calls, when the network notifies the user that the call has been assignated. For outgoing calls, when the user receives an indication that the other end user has answered the call). (11) Disconnection Request. (The user has asked the network to release the connection end to end, if exists, and he is waiting for an answer). (12) Disconnection Indication. (The user has received a disconnection invitation because the network has disconnected the connection end to end). (15) Suspension Request. (The user has asked the network to interrupt the call and is waiting for an answer). (17) Resume request. (The user has asked the network to resume a call that was previously interrupted and is waiting for an answer). (19) Release request. (The user has asked the network to release and is waiting for an answer). (25) Overlapped Reception. (Tha user has acknowledged the receipt of the call setup request from the network and is waiting for receiving extra information, if exists, about the call in overlapped way. For incoming calls).