Sec. 64.1601  Delivery requirements and privacy restrictions.

    (a) Delivery. Except as provided in paragraph (d) of this section, 
common carriers using Signaling System 7 and offering or subscribing to 
any service based on Signaling System 7 functionality are required to 
transmit the calling party number (CPN) associated with an interstate 
call to interconnecting carriers.
    (b) Privacy. Except as provided in paragraph (d) of this section, 
originating carriers using Signaling System 7 and offering or 
subscribing to any service based on Signaling System 7 functionality 
will recognize *67 dialed as the first three digits of a call (or 1167 
for rotary or pulse dialing phones) as a caller's request that the CPN 
not be passed on an interstate call. Such carriers providing line 
blocking services will recognize *82 as a caller's request that the CPN 
be passed on an interstate call. No common carrier subscribing to or 
offering any service that delivers CPN may override the privacy 
indicator associated with an interstate call. Carriers must arrange 
their CPN-based services, and billing practices, in such a manner that 
when a caller requests that the CPN not be passed, a carrier may not 
reveal that caller's number or name, nor may the carrier use the number 
or name to allow the called party to contact the calling party. The 
terminating carrier must act in accordance with the privacy indicator 
unless the call is made to a called party that subscribes to an ANI or 
charge number based service and the call is paid for by the called 
party.
    (c) Charges. No common carrier subscribing to or offering any 
service that delivers calling party number may
    (1) Impose on the calling party charges associated with per call 
blocking of the calling party's telephone number, or
    (2) Impose charges upon connecting carriers for the delivery of the 
calling party number parameter or its associated privacy indicator.
    (d) Exemptions. Section 64.1601(a) and (b) shall not apply when:
    (1) A call originates from a payphone.
    (2) A local exchange carrier with Signaling System 7 capability does 
not have the software to provide *67 or *82 functionalities. Such 
carriers are prohibited from passing CPN.
    (3) A Private Branch Exchange or Centrex system does not pass end 
user CPN. Centrex systems that rely on *6 or *8 for a function other 
than CPN blocking or unblocking, respectively, are also exempt if they 
employ alternative means of blocking or unblocking.
    (4) CPN delivery--
    (i) Is used solely in connection with calls within the same limited 
system, including (but not limited to) a Centrex system, virtual private 
network, or Private Branch Exchange;
    (ii) Is used on a public agency's emergency telephone line or in 
conjunction with 911 emergency services, or on any entity's emergency 
assistance poison control telephone line; or
    (iii) Is provided in connection with legally authorized call tracing 
or trapping procedures specifically requested by a law enforcement 
agency.

[ 60 FR 29490 , June 5, 1995;  60 FR 54449 , Oct. 24, 1995, as amended at  62 FR 34015 , June 24, 1997]