Comments Due Jan. 31 on Call Blocking FNPRM

An FCC order granting voice service providers terminating calls on an IP network permission to use session initiation protocol code 603 for call blocking notifications takes effect Jan. 31, said a public notice Tuesday in docket 17-59 (see 2112150039). Comments are due Jan. 31, replies by Feb. 14, on a Further NPRM on the use of SIP code 603 and fully implementing SIP codes 607 and 608, said Thursday's Federal Register.