[33098] in North American Network Operators' Group
Re: Dialup congestion and winter weather (fwd)
daemon@ATHENA.MIT.EDU (Mark Milhollan)
Fri Dec 29 12:25:23 2000
To: nanog@merit.edu
In-reply-to: Your message of Thu, 28 Dec 2000 00:07:02 -0500.
<20001228000702.A5932@iglou.com>
Date: Fri, 29 Dec 2000 09:22:08 -0800
Message-ID: <19557.978110528@ftel.net>
From: Mark Milhollan <mlm@ftel.net>
Errors-To: owner-nanog-outgoing@merit.edu
Jeff Mcadams writes:
>its been our experience that once all of the channels on all of the
>available PRI to the ISP are in use, the telco will generate an all
>circuits busy type of response as the PRI are trunk-side, so the
>switches typically treat them as inter-switch trunks being filled, not
>end lines to the ISP being full.
As always YMMV. The result is affected to a great extent by
provisioning. Which is obvious and yet hasn't been mentioned.
One way causes a call setup request to be sent even though the switch
knows that there are no available B channels, which permits the terminal
to make it's own decision as to the disposition of the call, e.g.,
refuse it with cause code 17 which _should_ cause some switch in the
call path (the originating one usually) to generate a normal busy tone.
