Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!lll-winken!telecom-request From: bill@jartel.info.com (Bill Cerny,Baja JarTel) Newsgroups: comp.dcom.telecom Subject: Re: Answer Supervision Information Sought Message-ID: Date: 20 Mar 91 17:08:06 GMT Sender: Telecom@eecs.nwu.edu Reply-To: "Bill Cerny,Baja JarTel" Organization: Jartel, San Diego, CA 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 11, Issue 221, Message 6 of 13 In article Barton F. Bruce writes: > First, on ground start trunks, then can they do it on trunks on a T1 > (not ISDN, just 24 vanilla trunks)? We've got Megacom WATS here (delivered over a T-1, E&M signalling). Here's what the A&B bits do during a call: Terminal Network -------- ------- Channel idle (on-hook) 00 00 Off-hook, no supervision yet 11 00 Answer supervision 11 11 Far end hangs up 11 00 Near end hangs up (on-hook) 00 00 I tried to get ground-start, dial tone trunks on the T-1 to the AT&T 4ESS, but I found out that the 4ESS only supports E&M signalling.