XOP Networks’ Ringdown Firebar Conference Server (RFCS) product is designed as a replacement for Tellabs 291/292 Firebar systems plus a lot more. These systems support FXS line side interface and can provide direct termination for analog Red emergency phones. These systems are also referred to as ‘Crashnet’ systems. Simply by going off-hook on a designated phone the initiator can trigger an emergency audio conference with other first responders. XOP Networks product can provide similar emergency conferencing in an all IP environment also. In that case, the system triggers a conference based on incoming SIP INVITE message instead of detecting flow of loop current.