3Com MSR 50 Series Configuration Manual page 442

3com msr 30-16: software guide
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442
C
22: ISDN C
HAPTER
ONFIGURATION
Check whether the dial-up configuration is correct. If dial-up is correctly
configured and the maintaining information "Q921 send data fail(L1 return
failure)." is not output, ISDN line may be not connected well.

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