Messages in this thread | | | Subject | Re: isdn driver (direct line access without using ttyI) | From | Henner Eisen <> | Date | 12 Jul 2000 00:16:34 +0200 |
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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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