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Line Polarity inversion for detect connect

Printed From: Way2call Communications
Category: Hi-Phone Software Development Kit (SDK)
Forum Name: Hi-Phone DLL
Forum Description: Discussion on the Hi-Phone product family, its DLL, samples and development tools
Printed Date: Apr 24 2024 at 12:41pm

Topic: Line Polarity inversion for detect connect
Posted By: Jos
Subject: Line Polarity inversion for detect connect
Date Posted: Dec 16 2009 at 2:42pm

Hello all,

I am currently detecting remote connection in outgoing calls using events for speech/tone detector. This method is quite imprecise and have problems when we connect with a silence destination.

It is know that in many PSTN lines there is a polarity inversion when remote picks up that could be used to detect this connected status and will be more accurately that the last one.

I have been testing whit SLIC_PolarityReversal member for struct that returns GetStatus function but it seems that always is set to 0Cry. I am using dll api.

Is there any method in Hi-Phone Desktop USB Lite to get this polarity status?


Posted By: doronsh
Date Posted: Dec 17 2009 at 5:10pm

The Hi-Phone Desktop Lite doesn’t support line polarity reversal feature.

This feature may be assist with Caller ID detection, but I’m not sure if it can give the connected indication.

Posted By: Jos
Date Posted: Dec 17 2009 at 6:33pm

Is there another method for detect this connected status without use speech/tone detector(more accurately)?

Perhaps another Hi-Phone modem? Our customer wants to calculate this time and with speech/tone detector values have undesired fluctuations.

Thanks Doron.

Posted By: doronsh
Date Posted: Dec 17 2009 at 7:01pm

Analog lines are not providing accurate way to detect the answer or connect state, and therefore the method is based on audio on the line, voice, silence ,.etc,..

Currently this is not supported by any of the Hi-Phone products, however, the Hi-Phone Desktop Pro may be able to report the line polarity reversal event, but again, I’m not sure if this feature designed for this purpose, and if the Telco line generates this line polarity reversal as soon as line is answered.

Can you verify this?

Posted By: Jos
Date Posted: Jan 19 2010 at 4:22am
Hello Doron,

Sorry for the delay. Our customer says that yes, line polarity can indicate remote connect, but I cannot check it yet. We have ordered you some Pro units to check it at our office.


Posted By: Jos
Date Posted: Jan 21 2010 at 10:08am

Hello Doron,

I have received the pro units. How I can read line polarity status?. Is there any specific event to inform about this or I must read any modem flag?


(I am using drivers 2.00.95 and Multipe devices DLL API 1.05.04)

Posted By: doronsh
Date Posted: Jan 21 2010 at 11:00am

The line reversal feature is not supported by the Hi-Phone Desktop Pro but not via the DLL and API's

We’ll send you a firmware update that supports this feature, and instructions how you can test it.



Posted By: Jos
Date Posted: Jan 22 2010 at 6:49am

Thanks Doron,

I'll wait for the firmware update.

Posted By: doronsh
Date Posted: Jan 22 2010 at 7:35am
firmware update has been emailed to you.

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