call progress detection
2005-05-04 by Farzlina Ab.Hadi
Thread
call progress detection
Re: [AVR-Chat] call progress detection
2005-05-04 by Dave VanHorn
At 01:26 AM 5/4/2005, Farzlina Ab.Hadi wrote: >hello..do you guys think that my approach for call progress >detection by sampling (using a port as input) at certain intervals >(using timers) is wise? is there any other way of doing it? Several companies make precise call progress detection chips.
Re: [AVR-Chat] call progress detection
2005-05-05 by Farzlina Ab.Hadi
well, currently i am using the ht9020 chip from holtek..so my question actually referring to reading the tone's cadence given by the chip. sorry for not specifying the chip earlier.
-------Original Message-------
At 01:26 AM 5/4/2005, Farzlina Ab.Hadi wrote:
>hello..do you guys think that my approach for call progress
>detection by sampling (using a port as input) at certain intervals
>(using timers) is wise? is there any other way of doing it?
Several companies make precise call progress detection chips.
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RE: [AVR-Chat] call progress detection
2005-05-06 by stevech
Call progress means many things:
Dial Tone detection
Ringing tone and various cadences of these
Busy – fast and slow busy
Called party answered – which in some phone company means a reversal of loop current
Called party hung up - which in some phone company means another reversal of loop current
Error tones- the bee-bee-bah you sometimes hear
Timeouts
Incoming ring (high voltage 20Hz
So it depends on what progress you want to detect.
It a’int easy which is why people buy $5 chips to do this.
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Farzlina Ab.Hadi
Sent: Tuesday, May 03, 2005 11:27
PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] call progress
detection
hello..do you guys think that my approach for call progress detection by sampling (using a port as input) at certain intervals (using timers) is wise? is there any other way of doing it?
thanks!
elin