For visual message waiting indicator (VMWI), pktcSigDevVmwiMode selects the alerting signal method. For the dtAsETS, rpAsETS, lrAsETS, osi, and lrETS methods, the FSK containing the VMWI information is sent after an alerting signal. For the dtAsETS method, the FSK, or DTMF is sent after the Dual Tone Alert Signal. For the rpAsETS method, the FSK or DTMF is sent after a Ring Pulse. For the lrAsETS method, the Line Reversal occurs first, then the Dual Tone Alert Signal, and, finally, the FSK or DTMF is sent. For the OSI method, the FSK or DTMF is sent after the Open Switching Interval. For the lrETS method, the Line Reversal occurs first, then the FSK or DTMF is sent. The value of this MIB object MUST NOT persist across MTA reboots.