burton@fortune.UUCP (05/30/84)
#R:cyb-eng:-38700:fortune:28000041:000:585
fortune!burton May 29 13:00:00 1984
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While it's nice to read that the call-waiting feature per se does not
cause problems with modems, I would find it a bit disconcerting to
be cut off without warning. What if I were doing a file transfer?
What if I were using an RCPM system at a busy time? Being off more than
30 second or so, the system would hang up on me, and I'd risk losing the
opportunity to reconnect?
Philip Burton 101 Twin Dolphin Drive-MS 133
Fortune Systems Redwood City, CA 94065 (415) 595-8444 x 526
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{ihnp4 [ucbvax | decvax!decwrl]!amd70 harpo hpda }!fortune!burtonjss@sjuvax.UUCP (06/13/84)
[Arent you hungry...] Call forwarding will *NOT* work - our site is on a PBX and we looked into this extensively. On many PBX's, call forwarded calls first test the initial target phone and then transfer if it is in use. In between the check and the transfer, a disconnect (briefly) is incurred. It is quite long enough for your computer to hang up. Further, the call forwarded *FROM* is briefly interrupted by the check - just as though a real operator had interrupted you to check the line in the real world. That interruption is more than enough for the computer to say forget it and hang up. The right way to handle this is to implement (at least on AT&T PBX's) something called Data Restriction and or Data Privacy (the first is more important). Data Restriction insures that come hell or high water, not even the local operator can break the line. Nor, of course, can call forward, so call forwarded calls are perceived as busied out. Then you must install line hunt software. The line hunt software does not interrupt any conversations and verifies the connection before it is made. This is the *ONE* part of our datacomm over telephones that we have never had troubles with. Good luck Jonathan Shapiro System Manager Haverford College Haverford, Pa.