| http://www.w3.org/ns/prov#value | - ying a called party and a calling party, initiating a first leg of a voice call to the called party, initiating a second leg of the voice call to the calling party, and switching the first leg to the second leg to establish the voice call therebetween. [0026] An aspect is an apparatus for switching a telephone call comprising means for receiving a SIP invite message over a data-bearing path of a c
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