Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.

Control means of an exchange comprising connection means for accommodating a telephone and the control means for controlling the accommodated telephone, receives a dial signal from the telephone without causing the telephone to respond to an incoming call when the telephone that is performing incoming call ringing is hooked off, causes the hooked-off telephone to respond to the incoming call when the received dial signal is a first dial signal, and causes the telephone as a call source to make a call without causing the hooked-off telephone to respond to the incoming call when the received dial signal is a second dial signal. Thereby, it is possible to make a call even during incoming call ringing.

A system for bulk telephony control system subscriber data manipulation, comprising an EMU server that receives a plurality of telephony control system subscriber data, analyzes at least a portion of the information, determines whether to modify at least a portion of the telephony control system subscriber data, the determination being based at least in part on the analysis, applies any determined modifications to at least a portion of the telephony control system subscriber data, and provides at least a portion of the information as output, and a method for bulk telephony control system subscriber data manipulation using an EMU server.

A communication server system may one or more processors and one or more non-transitory, computer-readable media storing instructions that, when executed by the one or more processors, cause the communication server system to detect a call event relating to a telephone network identifier. The system may dynamically link one or more active client accounts to a reservable private branch exchange (PBX) system identifier based on first details of the call event and second details of the one or more active client accounts. The PBX system may employ a session initiation protocol (SIP). The system may route call data between one or more devices associated with the active client accounts dynamically linked to the reservable PBX system identifier and a user device associated with the telephone network identifier.