[asterisk-users] OT - Avantages of ISDN PtP and PtmP

[Steve Davies]

2008/9/29 Olivier <oza-4h07 at myamail.com>:

> From  http://public.swbell.net/ISDN/connect.html :
>
> "If you only intend to connect a single device/application to your ISDN
> line, then you only need the point-to-point configuration. With the
> point-to-point configuration you are assigned a single phone number per ISDN
> line (not one for each B-channel). If you intend to connect multiple
> devices/applications, then you need the multipoint configuration. With
> multipoint configuration you are assigned a phone number for each device
> connected."
>

That is utter rubbish.

PtP mode is completely unrelated to how many numbers are allocated on
the line. It is possible that 1-to-1 is a common implementation where
an ISDN phone is being used, but that does not make it a requirement.

A "SETUP" packet arrives and it contains the caller-ID (usually) and
the called number (or a representation of it) - In PtMP, all devices
that are interested in handling the called number then "fight" over
who answers the call based in the received information, and in PtP,
the one device decides what to do with the call whether it wanted it
or not.

Regards,
Steve