asterisk users - Sep 2003 - X100P - Busydetect / calls being disconnected - Australia; tip.

Hi All,

This isn't really a question, but it's an issue I experienced that was
driving me crazy for a few days, so I thought it might be good for the
archives.

Basically what was happening was everytime a particular customer called
(long distance), the line would disconnect immediately after answering.

I thought it might have been the phone, so I swapped the phone with
another - still happened.

I thought that there was some remote possibility that the phone company was
reversing the line on answering long distance calls, so I switched to fxs_ls
instead of fxs_ks - no difference.

Various things were tried to no avail, until I made a long distance call
over a different carrier to our usual carrier (we use Optus, I made the call
over Telstra). When the remote end answered, my end disconnected.

What was happening was, when the call is answered, 5 quick chirps are sent
down the line. However, because of the bug in the Cisco 7960 causing the
first 1/2 a second or so of a conversation to be cut off - I didn't hear
these chirps and as such I didn't think of the next bit:

Basically, because I had busycount set to 3 and busydetect set to yes, these
chirps were being detected by the busydetect function and causing the call
to be disconnected. I raised the busycount to something safe (8) and this no
longer happened.

This has me worried for a while, especially as I'd just disconnected the old
PBX a few days ago and spent a nice amount of money on Cisco 7960 and 7940
IP phones (and will probably be ordering more in the near future).

Anyway, I'm pleased to report that everything is now working perfectly and
I'm extremely happy with Asterisk. I'd contribute, but alas I'm not
much of
a C programmer.

-Shaun

Because of the nature of busydetect algorithm busycount shouldn't be set
to less than 8. It's 10 by default.

Just imagine that you dial a number that is attached to some speed dial
key. It'll surely cause hangup if busydetect < 8.

Martin

On Sat, 27 Sep 2003, Shaun Ewing wrote:
> Hi All,
>
> This isn't really a question, but it's an issue I experienced that
was
> driving me crazy for a few days, so I thought it might be good for the
> archives.
>
> Basically what was happening was everytime a particular customer called
> (long distance), the line would disconnect immediately after answering.
>
> I thought it might have been the phone, so I swapped the phone with
> another - still happened.
>
> I thought that there was some remote possibility that the phone company was
> reversing the line on answering long distance calls, so I switched to
fxs_ls
> instead of fxs_ks - no difference.
>
> Various things were tried to no avail, until I made a long distance call
> over a different carrier to our usual carrier (we use Optus, I made the
call
> over Telstra). When the remote end answered, my end disconnected.
>
> What was happening was, when the call is answered, 5 quick chirps are sent
> down the line. However, because of the bug in the Cisco 7960 causing the
> first 1/2 a second or so of a conversation to be cut off - I didn't
hear
> these chirps and as such I didn't think of the next bit:
>
> Basically, because I had busycount set to 3 and busydetect set to yes,
these
> chirps were being detected by the busydetect function and causing the call
> to be disconnected. I raised the busycount to something safe (8) and this
no
> longer happened.
>
> This has me worried for a while, especially as I'd just disconnected
the old
> PBX a few days ago and spent a nice amount of money on Cisco 7960 and 7940
> IP phones (and will probably be ordering more in the near future).
>
> Anyway, I'm pleased to report that everything is now working perfectly
and
> I'm extremely happy with Asterisk. I'd contribute, but alas I'm
not much of
> a C programmer.
>
> -Shaun
>
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