Hostage negotiation telephone system

Claim 1

A telephone system for hostage negotiation or other crisis comprising: a self-contained power supply means; a microphone and speaker means for a negotiator whereby a negotiator can talk into and hear from the system; a receiver means for a coach whereby a coach can hear from the system; a telephone dialing means which stores a last telephone number called and is capable of retransmitting said last number called at the push of a button; an automatic interrupted telephone ringing means for ringing a perpetrator's telephone by a single push of a button; an off hook detector which senses if the perpetrator's telephone is off hook and generates an off hook signal in response thereto, the off hook signal is directed to the automatic interrupted telephone ringing means for switching off the ringing means; an off hook indicator means for alerting a negotiator that the perpetrator's telephone is off hook in response to the off hook signal; means for connecting said system to a standard telephone at a hostage-taking site for use as the perpatrator's telephone; means for connecting said system to a telephone line to a local telephone network; means for connecting together the microphone and speaker means, the perpatrator's telephone and the telephone line to form a conference call between a negotiator, a perpetrator and a third-party; and means for mixing audio signals and power to the system.