Messages in this thread | | | Date | Wed, 16 Jan 2002 23:01:31 +0100 | From | Sam Ravnborg <> | Subject | Re: ISDN CHANNEL-D |
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On Wed, Jan 16, 2002 at 08:58:02PM +0000, Padraig Brady wrote: > AstinusLists wrote: > > > Hello every one. > > > > I've been earing some rumors, that i am quite sure that are turth about the > > isdn channel d. > > > > As all of u know ( i think ) isdn cards have 3 channels: 2*64 and one time > > 16 kbs. > > > > This last one is called channel D. > > Channel D is used to dial and to reply to tones and minor stuff like that. > > Yes info is passed across the D channel in messages. There is a message > > type called User User information that can be passed, but only with and > associated D channel call type, i.e. you must pay for it.
What the original author refer to is utilising the D-Channel to support LAPB/X.25 traffic. This is done using a special SAPI=16 value. I dunno if the ISDN drivers in Linux support this yet.
Charging for the above is operator specific, when I worked with this in the past the charging was unrealistic high.
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