[Asterisk-Users] ISDN4Linux + Asterisk and Europe

[Klaus-Peter Junghanns]

hi kamido,


Am Die, 2003-06-03 um 12.37 schrieb tturner at gfs-zh.ch:
> Little summary what the status is:
> 
> 1. isdn4linux for real calls not just IVR forget it
> 2. capi4linux only works with cards active AND passive which do support capi
> at the moment those are eicon diva and cards from AVM
> The only passive card at the moment is the fritz card from AVM
> 
> Problems here are that the passive fritz cards have some annoying thinks like
> it's a binary library for the capi layer which is restricted for only one card 
> and no SMP box but you can circumvent this with the howto described at the 
> following site
> http://www.quiss.org/caiviar/Two-Fritzcards-HOWTO
> 
> which should enable you to use more then 1 card
> 
> however i didn't manage to get this configuration to work stable as Oliver Brandt
> reported, or I should say it's REALLY unstable at least here.
> And not only with the 2 card configuration but in any configuration
> which means 1 card,one CPU, 2 cards,one CPU and so on
> 
> so I ordered a AVM B1 PCI V 4.0   to eliminate that.
> 
> Pauline Middlelink had a suggestion which would be very nice, but i think nobody is
> able to do it at the moment . To use the zaptel driver and to implement a real 
> isdn4linux driver, because at the moment the isdn4linux is based on the modem-
> emulation of i4l and that is the reason why you have echo.

i am currently working on a zaptel BRI driver which will support the
very nice (also nicely priced) hfc-pci based cards and the multiBRI
cards. the driver will support TE and NT mode.
the reason for the echo is not only due to the high latency i4l design
(which was meant for data communication) but by todays high sensitive
mics in normal phones.

> 
> This approach would solve many problems.
> 
> You could use the Hisax cards not only on the outside like for the incoming calls 
> but also for internal isdn pbx phonesets which here in europe are cheap and have
> a lot of nice features already builtin. For this trick see isdn.jolly.de
> 
not all hisax cards do support the NT mode. iirc, only the chipsets from
CCD (hfc-pci, etc..) do.

> The echo would go away, because it is digital already and I think you could 
> count on a lower CPU usage as well.
eh?? what do you think the i4l audio is? the audio with isdn is always
digital. the term modem-emulation in i4l terms only refers to the
/dev/ttyXX stylish access from user space and the AT commands.


> 
> So maybe an interest group could get some funding together, to get more flexibility
> to the isdn side of asterisk
> 
i will gladly take every single euro!!! ;-)
> 
> hope this helps
> 
> greetings
> 
> kamido
> 

best regards

kapejod

-- 
Klaus-Peter Junghanns

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