/sys$common/syshlp/NCLHELP.HLB  —  enable  modem_connect, Exception Messages
 o  line connected

    The line is already connected and capable of handling data.

 o  call not permitted

    The call cannot be initiated because of the call retry rules
    of the PTT, or because of some other restriction. The exception
    includes an argument with more information about the exception.

    Argument:

    defer recall  The amount of time (in milliseconds) that must pass
    timer         before another call can be initiated on the line.
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