382 3Com® VCX V7111 VoIP Gateway User Guide Fourth (Burst) Ring Off Time [10 msec]: Ring Off period (in 10 msec units) for thefourth cadence on-off cycle.Examples of Various Ringing SignalsFigure 143 Examples of Various Ringing Signals[NUMBER OF DISTINCTIVE RINGING PATTERNS]Number of Ringing Patterns=3#Regular North American Ringing Pattern[Ringing Pattern #0]Ring Type=0Freq [Hz]=20First Ring On Time [10msec]=200First Ring Off Time [10msec]=400#GR-506-CORE Ringing Pattern 1[Ringing Pattern #1]Ring Type=1Freq [Hz]=20First Ring On Time [10msec]=200First Ring Off Time [10msec]=400#GR-506-CORE Ringing Pattern 2[Ringing Pattern #2]Ring Type=2Freq [Hz]=20First Ring On Time [10msec]=80First Ring Off Time [10msec]=40Second Ring On Time [10msec]=80Second Ring Off Time [10msec]=400Prerecorded Tones (PRT) FileThe Call Progress Tones mechanism has several limitations, such as a limited number ofpredefined tones and a limited number of frequency integrations in one tone. To work aroundthese limitations and provide tone generation capability that is more flexible, the PRT file canbe used. If a specific prerecorded tone exists in the PRT file, it takes precedence over thesame tone that exists in the CPT file and is played instead of it.Note that the prerecorded tones are used only for generation of tones. Detection of tones isperformed according to the CPT file.PRT File FormatThe PRT dat file contains a set of prerecorded tones to be played by the V7111 gatewayduring operation. Up to 40 tones (totaling approximately one minute) can be stored in asingle file in flash memory. The prerecorded tones (raw data PCM or L8 files) are preparedoffline using standard recording utilities (such as CoolEditTM) and combined into a single file
