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SubjectRe: isdn driver (direct line access without using ttyI)
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>>>>> "Michael" == Michael Mess <michael@michaelmess.de> writes:

Michael> There should be an ioctl for hook up. After using it you
Michael> "hear" the dialtone with read() from the device or giving
Michael> keypad commands by sending audio data of DTMF-tones with
Michael> write() to the device.

The current isdn LL-HL interface does not provide for accessing
b-channel data while no isdn connection is established. Thus, it won't
be possible to implement such a driver on top of the current LL-HL driver
interface. You would either need to extend the LL-HL-interface and modify
all HL drivers accordingly or to bypass the LL-HL-interface and hook directly
in a HL-driver of choice (i.e. HiSax).

It might also be possible to write such a driver on top of a HL-driver
which provides a CAPI interface. (There is even some experimental code
avaliable to add CAPI-support to HiSax, but I don't know whether this
implements all the CAPI features necessary for your driver semantics).

Henner

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