| http://www.w3.org/ns/prov#value | - Should it be desired to build all embodiments of the instant invention with a muting circuit such as is disclosed in FIG. 2, it will be apparent to those of ordinary skill in the art that the muting function may be removed for purposes of use on PBX systems or the like by placement of a jumper connection between junction 106 and the tip return terminal T1.
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