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A negative dBm level can be offset by ipbx_tone_gain. Allowed values for freq are from 0 to 
3000Hz. Allowed values for db levels are from –1 to –40 dB. 

 and tone_off_timeX are interleaved Tone On and Tone Off durations in msec. A 

value of zero for a Tone On time indicates a continuous tone. A value of zero for a Tone Off time 
produces silence, while a negative value (-1) terminates the tone pattern, removing the silencing. 
(With silencing, the voice channel is blocked until the tone pattern is stopped.) The maximum 
number of tones is four. The maximum number of on-to-off and off-to-on times counted individually 
is nine. 

For example, the default setting for initial North American dial tone is:  

 

where: 

 is the number of frequency/dB pairs (350, -19, and 440, -19)  

The first 0 is the number of on/off transitions in the tone pattern, in this case a constant tone.  

The second 0 indicates that the tone will be played until otherwise instructed.  

The first pair of frequency/dB (350, -19) specifies that the first tone is at 350Hz with a level of -19dB. 

The second pair of frequency/dB (440, -19) specifies that the second tone is at 440Hz with a level of 
-19dB.  

The final {0} specifies that there are no on/off times and that the tone is constant. 

The default tone used when a person 
begins any dialing operation 

2 0 0 350 -19 440 -19  

The alternate tone used when a 
person begins any dialing operation 

1 0 0 400 -16  

The tone used in cases where a 
person can dial a number to access a 
designated type of line 

2 0 0 420 -19 520 -19 

Indicates a message waiting 

2 7 0 350 -19 440 -19 100 
110 100 110 100 110 0 

Indicates a message waiting 

2 2 0 350 -19 440 -19 160 
160 

Indicates that calls are being 
forwarded 

2 3 0 350 -19 440 -19 250 
400 0 

Played while a call is being signaled 
before a confirmation is received from 
the SIP server 

0 0 0 (Silence) 

Played while a call is connecting 

2 2 0 440 -19 480 -19 2000 
4000 

Played when an incoming call arrives 
and the phone is in use 

1 2 0 440 -16 300 9700 

Played when a call is on hold longer 
than the timeout hold duration 

1 2 0 440 -16 300 9700 

Chapter 7:  Regionalization

                                                                                                                             

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