indication fi information element for a collective ringing while busy status lamp 211 is set to a status of 34 local hold 34 this would be observed as a 34 steady flutter 34 of the green led on an at amp t custom terminal and would be distinguished from the 34 flash 34 of the collective ringing while idle status indication that is the same flash as seen by a ringing call appearance on a custom isdn telephone in addition the signal information element is set to alerting pattern 4 for a brief audible alert on the covering terminal with the call reference cr set to null a national isdn switch would have the same message sequence but have a different fi information element based on the 5ess switch national isdn basic rate interface specification 5ess switch national isdn basic rate interface specification 5e8 software release at amp t 235 900 341 issue 1 0 december 1991 page 4 1 23 the fi information element of the information message would be set to 34 pending 34 to identify the collective ringing while busy status this would be distinguished from the 34 prompt 34 status that would be used to indicate.