[Asterisk-Users] Asterisk and ISDN

[Martin List-Petersen]

On Mon, 2004-11-15 at 20:35, Ken Chan wrote:
> Hello,
> Has anyone actually connect a BRI telephone to the
> BRI Card running Asterisk?

Sure Ackermann Euracom P4 and Teles.FON, no problems.

> I have been trying it and no luck so far.
> 
> Here is my configuration:
> H/W: T1 Trunk, a few VOIP phones, a few analog phones and
> a few BRI Phones (Lucent i2021 phone and Tone Commander phone).
> 
> S/W: Asterisk 1.0?????, Linux 2.4-18, "bri-stuff", "wct4xxp"
> and "wcfxs" S/W.

You would need to load either the "zaphfc" or "qozap" driver. Depending
on what BRI card you use. wct4xxp is for the quad E1/T1 card from Digium
and wcfxs is for the TDM400P.

> Here is my problem:
> I connected the BRI phone to the BRI Card and the Q921 Layer was up.  Then
> the phone send an Information Element (Q931 Msg) to the BRI Card.
> I think that IE message' data is [0x36 0x01 0x01] (it is Switch Hook Message).
> Then the Asterisk quicklly release the "call" (although I have not made a 
> call connection).
> 
> Anyway, I checked the "q931.c" file in "libpri" directory.  In the "q931_receive"
> routine, the only "Information Element" message the routine handles is "overlap" dialling stuff.  So, what ever that routine does not recongize, it sends "release" message right away.
> 
> So, if anyone has ever connect the BRI phone to the BRI card with Asterisk, please let
> me know what S/W you are using.

Just asterisk with bristuff, an old NTBA for termination and power on
the s-bus between the BRI card and the phone, card is hfc-s and of
course a ISDN cross-over cable (the quadbri and octobri would take care
of both power, termination and crosslink, so they don't need that).

But you need a HFC based BRI card and you need to load the correct
modules. wct4xxp and wcfxs have nothing to do with BRI support.
 
Slán lait,
Martin List-Petersen
Dublin, Eire 
(contact info on --> http://www.marlow.dk/)

> On Mon, 2004-11-08 at 06:59, Gianni Veloce wrote:
> >> Dear * Experts,
> >> I intend to use a laptop for Asterisk at home (because
> >> of space problems and as I  already have one spare).
> >> 
> >> I would like Asterisk to 'sit between' my ISDN (BRI)
> >> Line and use my existing ISDN telephone as extension.
> >> 
> >> After the hints from this list I learned that in order
> >> to do this I need a ISDN card capable of 'NT mode' for
> >> my telephone connection and another one (TE mode is
> >> enough) for connecting * to the BRI line.
> >> Needless to say that ISDN4Linux support is needed for
> >> both.
> 
> >That actually depends. There are two ways to archieve NT mode ISDN:
> >chan_mISDN and bristuff (i've only dealt with bristuff).
> 
> >So no, you don't need ISDN4Linux support, but either mISDN or the
> >zaphfc driver from bristuff.
> 
> >ISDN4Linux does not do NT mode, neither does chan_modem_i4l.
> >chan_capi can't do NT mode either.
> 
> >Even tough chan_mISDN (and mISDN in the 2.6 kernel, which is a
> >requirement for chan_mISDN) does support NT mode, it still needs the
> >hardware to support it, too. The only cards supporting it are the ones
> >based on Cologne Chip HFC-S chipset.
> 
> >Those are the same cards used for bristuff (which also utilises them on
> >2.4, no problems).
> 
> >> In my case the question is:
> >> What ISDN cards (NT Mode capable) are existing in
> >> PCMCIA format (laptop) and where can I buy them?
> 
> >I haven't come across any PCMCIA HFC-S cards yet, but they exist.
> 
> >Kind regards,
> >Martin List-Petersen
> 
>