Date: Wed, 8 Nov 2006 19:27:57 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Daniel Hartmeier <daniel@benzedrine.cx> Cc: freebsd-isdn@freebsd.org Subject: Re: ISDN4BSD / ihfc0 in NT-mode setup Message-ID: <200611081927.57954.hselasky@c2i.net> In-Reply-To: <20061108175118.GC6819@insomnia.benzedrine.cx> References: <20061108135555.GK14033@insomnia.benzedrine.cx> <200611081613.04423.hselasky@c2i.net> <20061108175118.GC6819@insomnia.benzedrine.cx>
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On Wednesday 08 November 2006 18:51, Daniel Hartmeier wrote: > On Wed, Nov 08, 2006 at 04:13:03PM +0100, Hans Petter Selasky wrote: > > It seems like you have configure the NT-side to P2P mode. > > > > Try running "isdnconfig -u 0 -p DRVR_DSS1_NT". > > > > Then "cat /dev/i4b > /dev/null &" or run "capitest -u 0 -i 1 -o 1". > > > > Then pickup the phone. Have "isdndecode" running concurrently. Do you > > hear the dialtone ? > > Yes, that was it. Now with P2MP and opening /dev/i4b it works. > > I wrote a little reader for the device, and when I pick up the receiver > on the phone, I get a dialtone, and I see MSG_CONNECT_IND messages with > the numbers dialed. The other way around, running capitest to dial the > phone, it rings. > > So the cabling seems fine and the basics are working, thank you very > much! > > Is the ioctl protocol (the MSG_* messages) something ISDN4BSD specific? Yes. > They seem to resemble Q.931 as far as event types go. Is there a way to > get access to the Q.931 layer directly from userland, without going > through any abstraction? If you don't open /dev/i4b, you can open /dev/ihfc0.0 instead. That gives you direct access to the D-channel. Currently it is not possible to insert frames at layer-3. > > What I'd like to do is write (in userland) a Q.931 <-> SIP relay, and > use ISDN4BSD for the ISDN side. Ideally, I could read/write Q.931 frames > to the device (having ISDN4BSD do the lower layers itself), i.e. get > access to the raw binary frames. > > It looks like i4btrc might already allow to read the Q.931 frames, is > there a way to inject frames on that level? No, /dev/i4btrcX does not allow insertion of frames. > Before I go dive into the kernel side of the ISDN4BSD ioctls, is this > already available (I'm still not sure what the effect of the P_* > protocols is on the userland interface)? Do you think it would be > difficult to implement? It depends on what you want to do. I would just use the CAPI 2.0 interface of I4B, and extend the CAPI protocol as needed. Then your system will look like this: ISDN -> I4B <-> CAPI <-> SIP --HPS
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