[Asterisk-Users] Channel Bank with E1

Wed Oct 29 07:36:33 MST 2003

Sergi,

I would say it depends of your budget. You can find on market different
channel banks. Some of them are very expensive and have all fancy features,
some of them are not so expensive and of course are missing some features.
We are using CAC and New Bridge chanell banks, they are working good and no
problem.

When you are looking for channel bank, make sure it supports Answer
supervision, it is very important feature. But I don't know what exactly are
you going to do within your netowrk for 100 phones..  Do they need all
features to be trasmitted like Calle ID , from outside world ?
Also you can take a look into Adtran or NewBridge. IF you have more specific
questions about them, please let me know.

Thanks,
Alexander

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----- Original Message ----- 
From: "Sergio Serrano Revuelto" <sergio.serrano at avanzada7.com>
To: <asterisk-users at lists.digium.com>
Sent: Wednesday, October 29, 2003 8:44 AM
Subject: [Asterisk-Users] Channel Bank with E1

I need connect up to 100 analog phone to a H.323 network through *. I
think use TE410P, But I need to know what channel bank is better. I use
E1 lines

Any idea?

Thanks in advance,
srsergio

-----Mensaje original-----
De: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] En nombre de DUSTIN
WILDES
Enviado el: miércoles, 29 de octubre de 2003 14:30
Para: asterisk-users at lists.digium.com
Asunto: RE: [Asterisk-Users] Answering Machine Detection

Thanks for all the info!
So I take it I would need to either build an additional APP to asterisk
like (voice_detection) or into an AGI and have that application or AGI
run after the call is Answered?

Fortunately it's not a telemarketing system!  :-)
It's an appointment reminder system for some of our employees.  Calls
them up and reminds them of important tasks like meetings and stuff.

-----Original Message-----
From: Michiel Betel [mailto:michiel at betel.nl]
Sent: Wednesday, October 29, 2003 8:11 AM
To: asterisk-users at lists.digium.com
Subject: RE: [Asterisk-Users] Answering Machine Detection

See
http://resource.intel.com/telecom/support/documentation/unix/SR50_linux/
html
_files/vox_feat/contents.html#TopOfPage chapter 2 for a basic insight on
Dialogic does it...

-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of Eric Wieling
Sent: woensdag 29 oktober 2003 3:12
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Answering Machine Detection

Humans tend to say "Hello?" (short burst of audio followed by silence),
and answering machines tend to say "I'm sorry I'm not here right now,
please leave a message after the beep" (long burst of audio followed by
a beep and silence).

So, basically you need to decide 1) what is audio and what is background
noise and 2) how long should there be audio followed by silence.

On Tue, 2003-10-28 at 19:25, Alastair Maw wrote:
> On 27/10/03 21:57, DUSTIN WILDES wrote:
> > Does anyone have any recommendations on implementing Answering
> > Machine detection for call generation programs?
>
> There's obviously no nice way of doing this.
> If you're doing telemarketing, and you're playing pre-recorded audio,
> which of course is a nasty thing to do, the algorithm is something
> like:
>
> 1. Dial out.
> 2. Wait for answer.
> 3. Start playing audio.
> 4. If you hear something that sounds like a beep, either hang up
>     and try again later, or stop the audio, pause for two seconds
>     and start playing it again.
> 5. Hang up when finished playing audio.
>
> Step 4 is accomplished by doing a FFT on the incoming audio into
> frequency buckets and taking a rolling average of the mean and
> standard deviation, such that you can detect when a fixed monotone
> beep occurs at the other end.
>
>
> If you don't want to play audio files and wait for beeps, and want to
> connect real humans to each other, then there's no decent way to do
> this, as the only difference between humans and arbitrary answering
> machines is that the answering machines give you a beep prompt to
> record your message.
>
> Regards,
-- 
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