How do you say "Recall" to a telephone?

Not that I know of. When you press redial on any phone I've tried, the controller in the phone drops the line, picks it back up again, then plays back the last dial sequence. Ie. hang up and try again.

Cheers, Nicholas Sherlock

Wouldn't it be easier just to send the number again?

Cheers.

Ken

Whoops, misread you the first time. Recall is dropping the line for some small amount of time (

Nope.

Yes, its a timed line break.

Its a lot simpler to just dial the number again when you have the dialing automated.

You need to be able to release and grab the line, you cannot do it with audio...

I think from memory that ATD@ is a hookflash command but then you're hoping that the modem correctly implements it and that it suits the line that's being used. It would be more reliable to dial again.

Cheers.

Ken

And yes, I went off on a tangent and he's using audio not a modem. Tea time, old chap.......

Ken

On Sun, 04 Dec 2005 16:01:36 GMT, David Segall put finger to keyboard and composed:

LOL. An acoustic coupler.

Why not use a modem and a built-in app? Windows 98, for example, has an app called "dialer.exe". You use the dialer to make the call and then hang up the modem after picking up your parallel connected telephone handset.

If you prefer to write your own app, then send commands such as ...

AT DT nnnnnnnn;

or ...

AT DT !*37#;

In the case of my Rockwell modem, the "!" flashes the switch hook for a period of time defined by S-register S29.

For example, AT S29=70 sets the hookflash duration to 700msec.

Listen for modem responses such as "BUSY", "NO DIALTONE", "VCON", etc.

The ATH and ATH1 commands cause the modem to go on-hook and off-hook, respectively.

If you have a "hardware" modem, then you could probably automate the dialing procedure using a simple DOS batch file.

-- Franc Zabkar

Please remove one 'i' from my address when replying by email.

The 'recall' function is commonly referred to as 'hook flash' where the line is dropped and picked up within a short period of time. There probably is a way to send some sort of command to the exchange hardware that tells it you want to initiate the same function as if you've flashed the line, but Telstra probably would do their utmost to make sure nobody can find out about it. 8-)

Craig.

"recall" is another name for a hook-flash (a rapiid onhook-offhook)

that's done with a '!' in the dial-string if your modem supports it.

atdt !*37# Bye. Jasen

I believe there are two standards for the duration of the hook-flash, and the Australian one is between 100-500ms. The other system is under 100ms, which was all that was supported on one old (non-approved) phone we bought. I used to simply bump the hang-up button instead, until we replaced it with a legal phone.

Clifford Heath wrote

Both were supported by Aust designed and manufactured T200s

Nope. It only did 100ms or 500ms, depending on the switch setting. There was no option for a TLB of under 100ms.

It's the usual hardware/software trade off. My study has two telephone lines and only one modem. My wife's study has no telephone lines and no modem but she does have a cordless phone. :)

That would be fine but it does not seem to work. I have tried sending the number followed by *37# in response to the engaged tone. I have also tried some variants involving one second pauses but all I get is the engaged tone. Is there some way of sending the number that you believe will work?

If you are getting busy tone, then you *must* hang up. Dialling anything else without hanging first is just pointless. Try it manually. The Recall code (*37#) is only a command that indicates that something else is to follow, it certainly is not the equivalent of hanging up & letting the line reset.

Kevin Martin

I think you are right but I was responding to a post that proposed sending the number again. "Hanging up first" does not solve my problem because sending the original number after hanging up, not surprisingly, results in the engaged signal again.

I don't understand this bit. *37# does not expect anything else to follow. Trying it manually indicates that if it is preceded by Recall (Flash) it results in the Call Back behaviour I am seeking.

Kwyjibo wrote

That is what I meant.

He was just misstating that.

Have a look at Asterisk - a free software pbx:

If using Asterisk itself isn't a solution to your problem (and it's a bit of overkill, just for a dialler!), reading through the source code may give you some helpful information.

Will