Rich Adamson wrote:
The *proper* way to see it is with a voltmeter. your off-hook voltage should
be between roughly -5 and -15 Volts DC. CPD should either disconnect the
battery (0V) or reverse the battery (-5-15VDC) briefly upon remote party
hangup.
Just to add to Andrew's comment above, the majority of US analog pstn
lines will disconnect battery for about 400 milliseconds. However,
a fair number of non-US countries either provide no disconnect supervision,
or use some other approach (eg, tones).
Thanks for your suggestions. Let me check with my provider if the
network supports CPD.
raj
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