Re: [Asterisk-Users] X100P doesn't check for dialtone

Fri, 08 Apr 2005 07:45:23 -0700



Malcolm Taylor wrote:

I have connected my home phone line into my asterisk box via an X100P, but have noticed that asterisk doesn’t check the line for dialtone before dialing, barging in on any non-asterisk call which is taking place.

 

I see from the voip-info.org wishlist that there is an outstanding item to ‘Listen for dial tone before dialing’ and I also see someone suggesting a solution for the problem by adding additional hardware into the home phone circuit.

What it SHOULD do is, check the DC voltage on the line, and if less than 8-10 volts, consider it BUSY/ unavailable/not connected, THEN check for dialtone before dialing. Also optionally listen for stutter dialtone before dialing, making the detection of stutter dialtone available for some other action.
Certainly these days even simple key/hybrid PBX switches monitor the DC status before allowing access to a line.

John Novack

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