Path: utzoo!telecom-request Date: Sat, 29 Jun 1991 19:36:21 GMT From: Vance Shipley Newsgroups: comp.dcom.telecom Subject: Answer Supervision (was: Modification of Ringback Tone) Message-ID: Organization: SwitchView Sender: Telecom@eecs.nwu.edu 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 502, Message 11 of 11 Lines: 31 In article Tom Perrine writes: > What kind of trunk provides "positive indication of answer supervision"? > Is this a test function in the CO, or can you get at this through a > porperly-featured PBX? The following trunk types inherently support answer supervision signaling: ISDN PRA (Primary Rate Access) ISDN BRA (Basic Rate Access) T-1 2 Wire E&M TIE 4 Wire E&M TIE Some operating companies now offer answer supervision on analog CO facilities. US West has tariffed it for sure (I have a copy). The PBX must be able to deal with the signaling though and I am not sure what equipement currently does. Either PRA or TIE definitly works with any good PBX by definition. Any trunk provided over T-1 should use the answer supervision signaling provided but some times the signaling is ignored by the switch (read "unexpected"). In this case programming the switch data base as a TIE line will work in some cases (eg. SL-1). Vance Shipley vances@xenitec vances@ltg ..uunet!watmath!xenitec!vances