[Asterisk-Users] ISDN (point to point) questions

[Danny Zak]

Hello;

we are looking to replace our current PBX with a *-box; it is
connected to ONE ppp isdn connection that is terminated by the NC.  We
got on this box 4 msn's configured.

currently we are working with pstn fxo's behind the PBX; it works but
we can't use the CSID information behind it.  We want to migrate and
keep the MSN's to decide routing in combination with the CID.

That's why we want to replace all our phones (8) with voip ones (or by
using a fxs's)

Reading all information i assume the following

- we need a ACTIVE ISDN card; these are 5/6 times more expensif that
passive ones.
        I always assumed there was only PPP and PMP; but it seems -
        reading the specs of the av. isdn card - that there is also
        multilink PPP.  Will a multilink PPP also support a PPP; or is
        this just a other way to describe a PMP ?
        
- how can i checke the number that is being dialed by the caller to
reachh the * box (so one of the 4 msn's).  I have seen dialplans
making use of the CALLERIDNUM; but what do i need to query for the
called num ?

-- 
Best regards,
 Danny                          mailto:dannyz at belgonet.com

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