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TNS Backs USTelecom Call Blocking Notification Petition

Transaction Network Services asked FCC Consumer and Governmental Affairs Bureau staff to grant USTelecom's petition to clarify its call blocking notification rules and allow the use of session initiation protocol code 603 "exclusively," said an ex parte letter posted Friday…

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in docket 17-59. The FCC should "defer any requirement relating to SIP Codes 607 or 608 until standards bodies have finalized the standards and the technical complexities have been addressed," TNS said.