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

[Bjoern Adler]

Hi Danny,

dont mix ppp and p2p...


pp = point to point
pmp = point to multipoint
(both are ISDN connection configurations)

ppp = point to point protocol
a higher level protocol for data transmission etc.

Of which type your ISDN connection is, is usually easy to decide looking
at your phonenumbers

A PMP has MSNs (usually (in Germany) up to 10 with EuroISDN)
There may be up to (I'm not sure...) 8  devices connected to one PMP
ISDN connection.

A PP has one base number with DIDs (like 234567-0 234567-10 234567-11
etc). There may only be one device connected to the ISDN connection.
And with PP you can have several BRIs or PRIs 'sharing' the same number.

Greetings

Bjoern

Danny Zak schrieb:

> 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 ?
>