[asterisk-users] newbie: intelligent handling of two ISDN lines (4 B-channels)

[Brian Candler]

On Tue, Oct 03, 2006 at 08:41:47PM +0200, Ekkard Gerlach wrote:
> I want to bundle two ISDN-lines (4 B-channels alltogether) with
> asterisk. I need it for remote administration of my customers. Sometimes
> the 2 B-channels of the first ISDN lines are busy (speech or data 
> connection), then asterisk should to take a free channel of my second ISDN
> line. 

Sounds like you want a trunk group?

http://www.voip-info.org/wiki/view/Asterisk+groups
http://www.voip-info.org/wiki/view/Asterisk+ISDN+overview

I'm not an ISDN user, but looking at README.misdn from
chan_misdn-0.3.0.tar.gz I see the following example:

[globals]
OUT_PORT=1 ; The physical Port of the Card
OUT_GROUP=ExternE1 ; The Group of Ports defined in misdn.conf

[misdnIn]
exten => _X.,1,Dial(mISDN/${OUT_PORT}/${EXTEN})
exten => _0X.,1,Dial(mISDN/g:${OUT_GROUP}/${EXTEN:1})
exten => _1X.,1,Dial(mISDN/g:${OUT_GROUP}/${EXTEN:1}/:dHello)
exten => _1X.,1,Dial(mISDN/g:${OUT_GROUP}/${EXTEN:1}/:dHello Test:n)

HTH,

Brian.