[asterisk-users] libpri and NT-Point to multi-point

[Andrew Thomas]

I would say the 'norm' in the UK is TE-ptp and NT-ptp or NT-ptmp (depends what is on the end of the port(s)).

If using NT-ptmp, then a 100ohm resistor is usually needed in the circuit somewhere - aka ISDN balun - (unless the card has this facility - like the B410P has).

HTH
Andy

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
Sent: 17 December 2008 10:36
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] libpri and NT-Point to multi-point


2008/12/17 Andrew Thomas <andy at datavox.co.uk>
I have piggy backed a few PBX's off the back of a B410P (4 x BRI) card with no problems.  The ones I used for testing were the Avaya IP Office, Siemens Hi-Path/Hi-Com and various old Panasonics.

All I had to do was to turn on the 100ohm termination on my S0 ports (set as NT on the B410P of course).

I actually have a similar set-up at the moment on our main asterisk system.  2 x BRI trunks (ports 1 & 2 set as TE ptp - for the DDI's etc) and 2 x BRI S0 bus (ports 3 & 4 set as NT ptmp) running and ISDN modem on each (good old Fritz! ones).

Fine, so, using  this setup as an example, would say the norm in the UK, is to connect to ISDN-BRI in ptp (reading from ports 1 and 2 configuration), or to connect using ptmp (reading from ports 3 and 4 configuration, dedicated to isdn modems) ?



So it is possible to run ptmp on NT ports using mISDN - just remember to turn on 100ohm termination on the ISDN card if you only have one device per port.

HTH
Andy

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
Sent: 17 December 2008 09:08
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: Re: [asterisk-users] libpri and NT-Point to multi-point

Hello Andrew,
2008/12/17 Andrew Thomas <andy at datavox.co.uk>
If you are connecting to BRI lines then you should be TE - not NT.

Yes of course, you're right.

I was mostly referring to this :
ISDN ------<BRI> ---- asterisk -----<BRI>----- legacy PBX

Then, in this case, as legacy PBX has a set of TE-PtmP or TE-PtP interfaces, asterisk box should also include such NT-PtP or NT-PtmP interfaces.

For instance, would you say that in the UK, most PBXes are using TE-PtP ?


You can run as TE ptp or ptmp with mISDN (not sure about DAHDI yet - not tried the new release).

HTH

 

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
Sent: 17 December 2008 08:14
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [asterisk-users] libpri and NT-Point to multi-point

Hi,

At the moment, libpri /w Asterisk 1.6, Dahdi 2.1, is not supporting NT-Point to multi-point mode.
Here (France), most small PBXes are connected to ISDN through BRI trunks in PtmP (don't know why but it seems the general case).
So this NT-PtmP function would be very helpful to easily slide an Asterisk box between an existing PBX and the network.

Does the same case apply elsewhere (UK, Germany, Italy, ...) ?
Do you think this is needed ?

Regards
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