On Mon, 31 Mar 2014 11:09:31 -0400 Fred Goldstein <fgoldst...@ionary.com> wrote: > On 3/31/2014 10:03 AM, wi...@mncomm.com wrote: >> I have a customer that we installed an IP phone system for. They moved their >>office to a new building where the telco couldn't or wouldn't bring service >>to. --snip-- > > > Which solution is best for the customer depends on how they use fax and how >critical it is. > > I just uploaded my FCC Comments on the AT&T "experiment", one which proposes >that fax capabilities be lost. I pointed out that fax is sometimes used for >reasons that distinguish it from email: Security and privacy (no middle man >server), knowledge of receipt (not just to a mailbox), and reliability (no >servers, no attachments).
I don't want to start a long thread about fax but --<RANT> Fax over copper was never either secure or private. The transmission always was fairly easy to intercept if you were snooping on a particular individual/business. Plus, you have no idea who walks up to the recipient fax machine which I maintain should disqualify it for both the legal and medical communities. Some of the old time phone phreaks used to have the CO automatically bridge lines to a cable pair that they had "acquired" during call setup. (Hopefully they were all chased out of the system some time ago) Fax is a loose standard and should have died out a decade ago. (IMHO) A peer-to-peer encrypted, standards based system would have been the likely result and this "silliness" about supporting analog fax would go away. </RANT> That said both of the methods mentioned in this thread work about as well as traditional copper which is less than 100%. Even on copper expect a few customer calls. > Internet fax is actually the worst of both worlds, >putting fax in series with email. So it's useful if you get the occasional >fax from someone who can't scan documents otherwise, but it's not useful if >you use fax the way pharmacies, doctors, and courts do. > > Since VoIP doesn't support modems or fax, if they need real fax, they need a >way to extend the signal ("dial tone") to the new site. This can't just run >over "best efforts" IP. But there are systems that do the timing and >buffering to enable TDM to be reliably emulated across a wireless link (I >suggest using a high-priority VLAN and no public IP). We're using the RAD >IPmux series. We're putting them in to replace T1s, for instance, to support >fire department voting receivers (very quality critical) across Ethernet >radios. Not exactly cheap, but it's a nice tool. They are available with >different types of interfaces. > > -- > Fred R. Goldstein k1io fred "at" interisle.net > Interisle Consulting Group > +1 617 795 2701 > Larry Ash Network Administrator Mountain West Telephone 123 W 1st St. Casper, WY 82601 Office 307 233-8387 _______________________________________________ Wireless mailing list Wireless@wispa.org http://lists.wispa.org/mailman/listinfo/wireless