Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!decwrl!hayes.fai.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request From: kabra437@pallas.athenanet.com (Ken Abrams) Newsgroups: comp.dcom.telecom Subject: Re: Supervision / Call Forwarding No Answer Message-ID: <12985@accuvax.nwu.edu> Date: 3 Oct 90 20:55:08 GMT Sender: news@accuvax.nwu.edu Reply-To: Ken Abrams Organization: Athenanet, Inc., Springfield, Illinois Lines: 48 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 709, Message 1 of 9 In article <12907@accuvax.nwu.edu> eli@pws.bull.com (Steve Elias) writes: >What do LD carriers do when they dial a number that the destination CO >has programmed as a "call forward - no answer", and the number >forwarded to is busy? In this situation, the caller hears a few >rings, and then a busy signal. Are you really sure it works this way? Is a PBX involved? The rule used to be (and STILL should be) that CFDA (call forwarding-don't answer) should only be sent to a number in the SAME SWITCH. The reason for this is the concern you expressed about the confusing progress of the call and the posibility of the supervision getting fouled up as the call is passed to another switch. If the call stays in the same switch, the status of the forwarded-to line is known and the call will NOT progress if that number is busy; the called line will just continue to ring. This in itself is a little confusing since it makes it appear that the call forwarding has stopped working. Having said all that, the situation will likely change with the implementation of CCIS/SS7. When it becomes possible to find the status of the forwarded-to line via an SS7 query, it should then be possible to CFDA outside the office and allow the call to progress only if the line is not busy. Switch boundaries become somewhat blurred with SS7. Ken Abrams uunet!pallas!kabra437 Illinois Bell kabra437@athenanet.com Springfield (voice) 217-753-7965 [Moderator's Note: You might be interested in knowing that your parent company Ameritech offers 'call transfer: busy/no answer' to cellular customers and it is NOT confined to the same CO, same LATA, or even the same area code. *71 on Ameritech cellular is immediate call forwarding; *72 is transfer on busy/no answer. I transfer from my 312 cellular number to my 708 voice mail number in the Centel CO. Cellular One offers the same thing here. On an unanswered call, the caller hears three or four rings, then a few seconds of silence as the call is withdrawn and sent to my voicemail. Then the caller hears the ringing resume again, or a busy signal. On both Cellular One and Ameritech Mobile, the 'if BY/DA' number is programmed each time it is used as desired by the user. Yet when I called Illinois Bell, I was told it was available for my residence phone, but the CO had to program it (all I would do is turn it on/off via *72/*73) and that it had to stay in the same CO. What does Ameritech know they are not telling Illinois Bell? PAT]