[Asterisk-Dev] best approach for a new isdn driver mainly for asterisk.. ?!

[Steve Brown]

This seems very reasonable. The call-level interface 
(linux.../Documentation/isdn/INTERFACE) to i4l looks pretty straight 
forward and would sure eliminate lots of moving parts.

Also, I'd think that an Asterisk system for a small business with 
existing isdn lines would have to support both bri lines and the 
currently-installed isdn phones. This would imply quite a few (probably 
more than 4) TE and NT ports.

Why not use a channel bank with bri card(s) and a Digium E1/T1 
interface? There is no hardware to design and build. The cards are 
configurable as either TE or NT. They are already certified for use in 
most countries. The layer 1 protocol is completely handled by the card 
so an i4l hardware driver interface to zaptel should be easy. And 
lastly, if you want to do this on a budget, used channel banks and bri 
cards are pretty cheap. I recently bought a Premisys cb and six 8 port 
bri-u cards on ebay and haven't yet spent $200.

Just a thought,

Steve

Iain Stevenson wrote:

> Surely all that is needed is a better driver than chan_modem_i4l.  
> There are already many passive ISDN BRI cards that could probably 
> provide parity of performance with Digium's analogue cards.  An ISDN 
> driver that misses out the modem interface and gets straight to the 
> hardware might address the latency and echo problems with the current 
> ISDN solution.
>
>  Iain
>
>
>
>
>
> --On Sunday, April 27, 2003 7:58 pm -0500 Mark Spencer 
> <markster at digium.com> wrote:
>
>>> Imho Digium could generate some nice revenues if they sold the
>>> appropriate hardware that support ISDN lines and ISDN phones and add
>>> support for it in Asterisk. Given the rather gloomy economic outlook in
>>> Europe, such a financially attractive and feature rich solution 
>>> would be
>>> appealing to small cost conscious businesses.
>>
>>
>> This has not escaped our attention.  Digium is currently investigating
>> ISDN possibilities, with a focus on the European BRI market first.  
>> We do
>> not have any firm plans at this state, but we'd be happy to hear from 
>> you
>> guys.
>>
>> Mark
>>
>> _______________________________________________
>> Asterisk-Dev mailing list
>> Asterisk-Dev at lists.digium.com
>> http://lists.digium.com/mailman/listinfo/asterisk-dev
>>
>
>
>
>
> _______________________________________________
> Asterisk-Dev mailing list
> Asterisk-Dev at lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-dev
>