North American Network Operators Group|
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Re: Dialup congestion and winter weather (fwd)
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.