Alan Gilbertson <Alan.Gilbertson@f230.n3603.z1.fidonet.org> (05/17/91)
Forwarded from FidoNet's MDF echo by Nigel Allen (ndallen@contact.uucp)] A piece of troubleshooting just completed here may be relevant for other telecomm managers who run into this situation: suddenly a percentage of calls from a PBX to local telco CO (as opposed to calls routed direct to an IXC) return "Your call cannot be completed as dialed" or "Your long distance company cannot complete your call as dialed" (when the number dialed was a local call. At least some cases, adding CLASS services eats up processor time and increases the time between a ground flash acknowledgement to the PBX and the attachment of DTMF receiver/register in the CO. If the PBX begins sending digits too soon, the CO can miss the first one or two. I had never seen this particular problem until relatively recently, when users began reporting a high percentage of apparent misdials, particularly during high local traffic periods. The start of the problem coincided with the introduction by the LEC (GTE in this case, using a GTD5 end office) of some new CLASS services. Increasing the pre-dial delay on outpulsing from the PBX completely handles this, needless to say, but it was a mystery for a week or so until we were able to correlate the dates the trouble began and the introduction of the CLASS services. Alan