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Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Chapter 8 Profile and Web Page Parameters and Defaults
Parameter Details
• TAmplitude_1 and TAmplitude_2 are the transformed amplitudes (volumes)
of the first and second frequencies, respectively. Calculate each value as
follows:
A * 32767 * sin(2 * pi * Frequency/8000)
where:
–
A is the amplitude factor, which controls the volume. This value is
calculated as follows, where k is the desired volume in dBm and n is the
number of frequencies (1 or 2):
A = 0.5 * 10
((k + 9 – (n – 1) * 3) / 20)
For example, for a one-frequency tone with a volume of –19 dBm,
A = 0.5 * 10
((–19 + 9)/20)
= 0.16
–
Frequency is the desired frequency in Hz
• NumOfOnOffPairs is the number of on-off pairs in the cadence of the tone (0,
1, or 2). For a steady tone, use 0.
If this value is 0, the OnTime_1, OnTime_2, OffTime_1, and OffTime_2 values
must also be 0.
• OnTime_1 and OnTime_2 are the lengths of time that the first and second
on-off pairs of a cadence play a sound, respectively. (See Figure 8-1 for a
graphical representation.)
Specify each value as a number of samples with the sampling rate of 8 kHz.
The range of each value is 0 to 0xffff.
For example, for a length of 0.3 seconds, set a value to 2400.
• OffTime_1 and OffTime_2 are the lengths of silence after the sound of the first
and second on-off pairs of a cadence, respectively. (See Figure 8-1 for a
graphical representation.)
Specify each value as a number of samples with the sampling rate of 8 kHz.
The range of each value is 0 to 0xffff.
For example, for a length of 0.3 seconds, set a value to 2400.