deb isdn Q931 on each router
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BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()
BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()BAD FRAME()
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deb isdn q921 on the first router
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*Mar  1 00:32:32.996: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:33.697: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:33.994: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:34.695: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:34.995: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:35.697: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:35.997: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:36.694: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:42.007: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:43.005: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:43.718: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:44.006: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:44.715: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:45.008: ISDN Se1/0:15 Q921: User TX -> SABMEp sapi=0 tei=0
*Mar  1 00:32:45.717: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)
*Mar  1 00:32:46.715: ISDN Se1/0:15 Q921: User RX <- BAD FRAME(0x00017F)

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deb isdn q921 on the Second router : 

Apr  7 16:16:28.762: ISDN Se0/1/0:15 Q921: User TX -> RRp sapi=0 tei=0 nr=0
Apr  7 16:16:28.774: ISDN Se0/1/0:15 Q921: User RX <- RRf sapi=0 tei=0 nr=0
Apr  7 16:16:30.966: ISDN Se0/1/1:15 Q921: L2_EstablishDataLink: sending SABME
Apr  7 16:16:30.966: ISDN Se0/1/1:15 Q921: User TX -> SABMEp sapi=0 tei=0
Apr  7 16:16:31.966: ISDN Se0/1/1:15 Q921: User TX -> SABMEp sapi=0 tei=0
Apr  7 16:16:32.966: ISDN Se0/1/1:15 Q921: User TX -> SABMEp sapi=0 tei=0
Apr  7 16:16:33.330: ISDN Se0/1/1:15 Q921: User RX <- BAD FRAME(0x00017F)
Apr  7 16:16:33.330: ISDN Se0/0/1:15 Q921: User RX <- RRp sapi=0 tei=0 nr=3
Apr  7 16:16:33.330: ISDN Se0/0/1:15 Q921: User TX -> RRf sapi=0 tei=0 nr=3
Apr  7 16:16:33.966: ISDN Se0/1/1:15 Q921: User TX -> SABMEp sapi=0 tei=0
Apr  7 16:16:34.330: ISDN Se0/1/1:15 Q921: User RX <- BAD FRAME(0x00017F)
Apr  7 16:16:35.330: ISDN Se0/1/1:15 Q921: User RX <- BAD FRAME(0x00017F)