Editing Conspiracy BBS Archive/nsa-egb (section)

===Use Of Secure And Non-Secure Telephones===
 
Two separate telephone systems have been installed in NSA facilities
for use in the conduct of official Agency business:  the secure
telephone system (gray telephone) and the outside, non-secure
telephone system (black telephone).  All NSA personnel must ensure
that use of either telephone system does not jeopardize the security
of classified information.
 
The secure telephone system is authorized for discussion of
classified information.  Personnel receiving calls on the secure
telephone may assume that the caller is authorized to use the system.
However, you must ensure that the caller has a "need-to-know" the
information you will be discussing.
 
The outside telephone system is only authorized for unclassified
official Agency business calls.  The discussion of classified
information is not permitted on this system.  Do not attempt to use
"double-talk" in order to discuss classified information over the
non-secure telephone system.
 
In order to guard against the inadvertent transmission of classified
information over a non-secure telephone, and individual using the
black telephone in an area where classified activities are being
conducted must caution other personnel in the area that the
non-secure telephone is in use. Likewise, you should avoid using the
non-secure telephone in the vicinity of a secure telephone which is
also in use.