Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!sdd.hp.com!elroy.jpl.nasa.gov!decwrl!hayes.ims.alaska.edu!accuvax.nwu.edu!nucsrl!telecom-request From: mitel!spock!grayt@uunet.uu.net (Tom Gray) Newsgroups: comp.dcom.telecom Subject: Re: CPC / "Wink" Call Termination Message-ID: <14617@accuvax.nwu.edu> Date: 12 Nov 90 13:20:50 GMT Sender: news@accuvax.nwu.edu Reply-To: Tom Gray Organization: Mitel. Kanata (Ontario). Canada. Lines: 19 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 814, Message 2 of 10 >>I'm wondering if anyone here knows exactly (or not so exactly :-) ) >>what the "wink", or I believe it is sometimes called "CPC" signal is. Tom Gray wrote: >The problem described here occurs on loop start lines on which no >answer supervision is provided. A call is answerd by a machine The Tom Gray now humbly writes perhaps I should truly read the question before I pontificate on telephone loop siganlling. The writer asked a simple question on how his answering machine worked. I replied with the mechanisms which would be used by expensive CPE equipment which needs to eliminate fraud and to maximize the use of trunks. My answer was true for CPE. For the question on answering machines, the machine detects the end of the conversation by detecting dial tone. When the calling party clears, the connection will be broken. The local office will time out and regard the off hook from the answering machine as an origination and provide dial tone.