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Describe the events represented by this debug isdn q921 output:
RX <- IDCKRQ ri = 0 ai =127
TX -> IDCKRP ri 52714 ai = 115
RX <- IDREM ri =0 ai = 73
The ISDN switch uses an ID check request (IDCKRQ) to verify that the TEIs assigned are still in use. The router responds with an IDCKRP message, saying that 115 is in use. The switch tells the router to remove 73. (Some switches do not send a message to remove TEIs. You may have to reboot the router to remove an unused TEI. The 5ESS, DMS-100, and National ISDN switches do not remove TEIs even when a Layer 1 failure occurs.)