Voice Over DSL
The "Holy Grail" for CLEC/DLEC'S is a multiplexer that provides multiple voice lines and data over 1 or 2 pair of DSL the same as can be done with T1. These are generally called "soft-switches" because they are comprised of a central controlling computer, and adjunct computer that manages features, another computer that interfaces with the SS-7 cloud (There is a "universal" signal system 7 network. It is a very secure, redundant, network that overlays and compliments the telephone network. All signaling between telephone switches is done over this network.
If you pick up your phone and dial a number across the country, the SS7 network queries each switch in the path between you and the far end to see if ports and trunks are available to make the call, and if the line at the far end is idle. If the line is idle and there is a path the SS7 network tells all the switches involved to put the circuit together and ring the bell at the other end. If the line is busy at the other end, the SS7 network tells your local switch to give you a busy signal.
Likewise your local switch gives you an ATB (All Trunks Busy) recording if there are no circuits available. This means that if the far end is busy, no facilities in between you and the far end are tied up while you get a busy signal --a huge benefit in large networks.) and the peripheral "switch" components that physically exist in every CO to connect to the copper pairs going to the customers.
There are several products out there but they're "not soup yet". Providing an alternate voice service means you're competing with the service provided by a telephone switch.
The most common switches out there are the Northern Telecom DMS-100 and Lucent's 5ESS. They have both been around for more than 15 yrs and have more options and capabilities sitting latent within them than anyone can imagine.
When an ILEC starts advertising a "new" feature, the work to their order entry/provisioning/billing system was done to allow them to flip a 0 to a 1 somewhere in a switch. The features have been there forever, they exist in software, it doesn't cost an ILEC a dime to turn one on.
Even if soft-switches do evolve, the CLEC is still dependant on the ILEC for CO (central office) space and the copper wire in the last mile. This availability only exists on a 3yr term. The competitive environment is analyzed every 3 years and one of these days the switch could get thrown and the could tell the CLEC'S to build their own CO's and cable plant.
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