e/Permanent signal

Information
has gloss	eng: Permanent Signal (PS) in US telephony jargon, or Permanent Loop in British usage, is a condition in which a POTS line is off-hook without connection for an extended period of time. This is indicated in modern switches by the silent termination after the off hook tone times out and the telephone exchange computer puts the telephone line on its High & Wet list or Wetlist. In older switches, however, a Permanent Signal Holding Trunk (PSHT) would play either howler tone or 480 Hz high tone (which would subsequently bleed into adjacent lines via crosstalk). Howler tone is a tone of increasing intensity that is intended to alert telephone users to the fact that they have left the receiver off the hook without being connected in a call.
lexicalization	eng: Permanent signal
instance of	c/Telephony signals