[asterisk-users] Busy (congestion) signal and cell phones

[Mark Gimelfarb]

I'm in the US, so I was originally using the US tones.
Looks like I'm getting a disconnect with both CONGESTION and BUSY. In  
fact, I wasn't actually using Congestion() and Busy(), I just did  
Playtones() for both of those. There is no reason to send PRI messages  
to cell phones, is there? The way I understand, they do frequency  
interpretation on the incoming tones, just like analog lines do  
voltage variations. So, to test that, I Playtones()'ed (Pardon my  
DialPlan-ish dialect) Austrian busy tones--and the cell phone actually  
played tones back to me. So, to me that means that cell phones look  
for  frequency sequences that they recognize.

Now, here's an interesting observation. If I take an analog phone and  
take it off hook and then call that number from a cell phone, I do  
hear a busy tone. Is that because analog equipment doesn't generate  
the exact tone sequence due to analog limitations? This is in addition  
to my original question.

Regards,
Mark.


> What country are you in??  Yes, it is common for cell phones to  
> disconnect the call if they receive CONGESTION, but not BUSY.

> Horwich IT Services (Godwin Stewart) wrote:
>> It *is* standard procedure for a cellphone to terminate a call immediately
>> it discovers that the called number is busy. It will then, optionally,
>> initiate its auto-redial function etc.

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