Date: Sun, 25 Nov 2001 18:32:38 +0100 (CET) From: Leif Neland <leifn@neland.dk> To: Andrew Gordon <arg-bsd@arg1.demon.co.uk> Cc: <freebsd-isdn@FreeBSD.ORG> Subject: Re: bidirectional /dev/i4btel0 ? Message-ID: <20011125182631.U50532-100000@arnold.neland.dk> In-Reply-To: <20011125163647.E42138-100000@server.arg.sj.co.uk>
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On Sun, 25 Nov 2001, Andrew Gordon wrote:
> On Fri, 23 Nov 2001, Gary Jennejohn wrote:
>
> > On Friday 23 November 2001 13:04, Leif Neland wrote:
> > > Is it somehow possible to both be sending and recieving from
> > > /dev/i4btel0?
> > >
> > > I would like to send voice to the caller, while also recieving
> > > data, eventually decoding with dtmfdecode to make a
> > > voice-response system.
> > >
> > > dd of=${DEVICE} if=${LIBDIR}/leifans.al bs=2k >/tmp/out.log
> > > 2>&1 & sleep 2
> > > dd if=${DEVICE} of=/tmp/answers.al bs=2k count=100
> > > >/tmp/in.log 2>&1
>
> Doing this with two independent processes is never going to work usefully,
> due to the need to synchronize the transmit with the receive (eg. you want
> the outgoing message to stop and switch to the next action immediately on
> decoding a DTMF key, not some seconds later).
My idea was sampling the input in say 0.5 secs, then run dtfmdecode to see
if a key was pressed. If so, then kill the backgrounded process. If not,
loop back and sample again.
But as the simple test above didn't work, there was no reason to develop
further.
Leif
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