In data transmission, a response that does not contain sequence numbers in the control field.

A function performed by the network if a call remains parked longer than a predesignated time limit, or if the parked party disconnects. [T1.653-1996]

A subject without appropriate privileges to perform an operation [POSIX.6].

Text for which no internal structure is defined and is unambiguously understood by a typical user [POSIX.6].

Synonym unsuccessful call attempt.

A call attempt that does not result in the establishment of a connection. Synonym unsuccessful call.

[A] Process that has not been evaluated or examined for adherence to the security policy. It may include incorrect or malicious code that attempts to circumvent the security mechanisms. [INFOSEC-99]

Synonym illegal character.

With respect to telecommunications plant, any current that is not intentionally supplied from the central office or from telephone equipment. [After T1.316-1997]

With respect to telecommunications plant, any voltage that is not intentionally supplied from the central office or from telephone equipment. [After T1.316-1997]