home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky sci.electronics:20946 alt.cyberpunk:6707
- Newsgroups: sci.electronics,alt.cyberpunk
- Path: sparky!uunet!mcsun!sunic!aun.uninett.no!ugle.unit.no!humpty.edb.tih.no!lumina.edb.tih.no!ketil
- From: ketil@edb.tih.no (Ketil Albertsen,TIH)
- Subject: Re: Caller ID block?
- Message-ID: <1992Dec17.091253.10174W@lumina.edb.tih.no>
- Sender: ketil@edb.tih.no (Ketil Albertsen,TIH)
- Organization: T I H / T I S I P
- References: <1g2lufINN842@hp-col.col.hp.com> <1992Dec14.013239.1@acad3.alaska.edu> <1992Dec15.152116.26829@newstand.syr.edu> <1992Dec16.161901.24782@krfiny.uucp>
- Posting-Front-End: Winix Conference v 92.05.15 1.20 (running under MS-Windows)
- Date: Thu, 17 Dec 1992 09:12:42 GMT
- Lines: 29
-
- In article <1992Dec16.161901.24782@krfiny.uucp>, jeffj@krfiny.uucp (J. Jonas) writes:
-
- >No, the source of the information is the switch generating the
- >SS7 commands. As a subscriber, you cannot directly control the messages.
- >The days of in band signalling are over.
-
- Depends on how direct is "direct". In an ISDN phone, the SETUP message
- is generated by subscriber equipment (e.g. a PC), optionally containing
- a "calling party number" information element (and a similar subaddress
- info element). The 'screening indicator' field of this info element
- may take the values 'User-provided, not screened', 'User-priovided,
- verified and passed', 'User-provided, verified and failed' or 'Network
- provided' (Q.931, section 4.5.10, table 4-10). The Setup message is
- certainly carried by SS7 across the net.
-
- If unique caller IDs are to be transmitted for each individual phone
- connected to a PABX (which by definition is subscriber equipment),
- there is no other way to do it than having the phone itself or the
- PABX supply the ID to the network.
-
- >> Since your phone can transmit to the other line before the phone is
- >> picked up, it should be quite easy to implement this.
- >
- >On what equipment is this allowed? Certainly no ESS or crossbar that's
- >commonly used around here.
-
- On all ISDN phones, and through all switches supporting ISDN. (But I
- agree that it ISDN phones are not "commonly used"!)
-
-