asterisk users - Nov 2009 - distribute free call minutes over different channels

Hi,
I have 4 ISDN channels (2 lines) and each line may do calls of up to 360 
minutes/month for free. 
As I understand asterisk will pick the first available line so the probability 
is big that the other lines will not use their free minutes and the firs line 
will exceed the free minutes.
How can I configure asterisk in a way that it looks up in the CDR which ISDN 
line has lest calling time in the present month and chosse this?

Kind regards
Eckhard

Couldnt you do this by calling MySql?  Compare who has the least minutes
used and then send it out the appropriate channel?

--Matt

On Tue, Nov 24, 2009 at 7:07 AM, Eckhard Jokisch
<e.jokisch at orange-moon.de>wrote:
> Hi,
> I have 4 ISDN channels (2 lines) and each line may do calls of up to 360
> minutes/month for free.
> As I understand asterisk will pick the first available line so the
> probability
> is big that the other lines will not use their free minutes and the firs
> line
> will exceed the free minutes.
> How can I configure asterisk in a way that it looks up in the CDR which
> ISDN
> line has lest calling time in the present month and chosse this?
>
> Kind regards
> Eckhard
>
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-- 
Matthew Desbiens
603.581.3160
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On Tue, Nov 24, 2009 at 01:07:28PM +0100, Eckhard Jokisch
wrote:
> Hi,
> I have 4 ISDN channels (2 lines) and each line may do calls of up to 360 
> minutes/month for free. 
> As I understand asterisk will pick the first available line so the
probability
> is big that the other lines will not use their free minutes and the firs
line
> will exceed the free minutes.
If you use chan_zap or chan_dahdi, you can use r/R instead of g/G to go
round-robin through the channels rather than start from the first/last
(respectively). This would give you a rather even spreading of the
outgoing calls.

-- 
               Tzafrir Cohen
icq#16849755              jabber:tzafrir.cohen at xorcom.com
+972-50-7952406           mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com  iax:guest at local.xorcom.com/tzafrir

On Tuesday 24 November 2009 13:10:43 Tzafrir Cohen
wrote:
> On Tue, Nov 24, 2009 at 01:07:28PM +0100, Eckhard Jokisch wrote:
> > Hi,
> > I have 4 ISDN channels (2 lines) and each line may do calls of up to
360
> > minutes/month for free.
> > As I understand asterisk will pick the first available line so the
> > probability is big that the other lines will not use their free
minutes
> > and the firs line will exceed the free minutes.
> 
> If you use chan_zap or chan_dahdi, you can use r/R instead of g/G to go
> round-robin through the channels rather than start from the first/last
> (respectively). This would give you a rather even spreading of the
> outgoing calls.
> 
I tried like this:
exten => _0.,1,Dial(msidn/r:extern/${EXTEN}:1)

where "extern" is the chapter in the misdn.conf that looks like
[extern]
ports=1,2,3,4
context=isdn
msns=*


But this does not work at all. Asterisk can not setup a channel.
What would be the right syntax to invoke round robin in Dial command?

BR
Eckhard