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- From: bob1@cos.com (Bob Blackshaw)
- Subject: Re: Subaddressing (was: ISDN/analog interfacing)
- Message-ID: <bob1.728144888@cos>
- Organization: Corporation for Open Systems
- References: <1993Jan26.62314.11147@kei.is.s.u-tokyo.ac.jp> <C1GM74.Czq@sranhd.sra.co.jp> <1993Jan26.154701.8499W@lumina.edb.tih.no> <scott.728100851@labtam>
- Distribution: world
- Date: Wed, 27 Jan 1993 14:28:08 GMT
- Lines: 41
-
- In <scott.728100851@labtam> scott@labtam.labtam.oz.au (Scott Colwell) writes:
-
- >ketil@edb.tih.no (Ketil Albertsen,TIH) writes:
-
- >>In article <C1GM74.Czq@sranhd.sra.co.jp>, nisimura@sran233.sra.co.jp (Tohru
- >>Nishimura) writes:
-
- >>>For example, when you call an ISDN number with ordinal analog telephone
- >>>(with/without ISDN), and there is no voice equipemnt at called side, no
- >>>ringing occurs; Synthesising (woman) voice would answer; "There is no
- >>>equipment you can talk with.....", even if "dataline" ISDN TA or ISDN/IP
- >>>card is attached at called side. This is a Japanese implemetation. I
- >>>don't know other countries' implementation.
-
- >>It sounds as if you are running some timeout-counter in the NT1 to detect
- >>that none of the connected units responds.
-
- >The timeout happens at the exchange. It sends a setup message to any
- >devices on the S i/f, they can either decide to ignore it or they can
- >respond with an alerting message (meaning that they are 'ringing the phone').
-
- >When the call is accepted locally ('picking up the phone'), a connect message
- >is sent to the exchange.
- >--
- I would imagine that in the case Nishimura San was commenting upon, i.e.,
- an ordinary analog voice call into the ISDN world, the I.500 series of
- CCITT Recs would have something to say. At the POTS to ISDN interface
- point, the ISDN part would need to construct a SETUP message and fill
- in as much detail as possible. If it 'knows' that the POTS call is
- voice, the SETUP should identify it as such. At the called line, the
- compatibility check procedures could take place as normal.
-
- I believe that this last study period has seen much work done on the
- I.500 series, someone who attends the meetings might comment.
-
- >Scott Colwell Labtam Australia Pty. Ltd.
- >net: scott@labtam.labtam.oz.au 41 Malcolm Rd., Braeside
- >phone: +61-3-587-1444 Melbourne, Australia 3195
-
- Bob.
-
-