[asterisk-users] Connecting Asterisk and BT Versatility PBX via NT BRI port

[Roberto Fichera]

Il 01/08/2014 21.13, Richard Mudgett ha scritto:
>
>
>
> On Fri, Aug 1, 2014 at 1:26 PM, <kernel at tekno-soft.it
> <mailto:kernel at tekno-soft.it>> wrote:
>
>     On Fri, 1 Aug 2014 12:39:18 -0500, Richard Mudgett wrote:
>
>         On Fri, Aug 1, 2014 at 12:03 PM, Roberto Fichera  wrote:
>
>
> <snip>
>  
> Does anyone know how can I solve this problem?
>
>
>         You might want to try bri_net_ptmp since bri_net is for
>         point-to-point
>         operation
>         and you are not getting any response from the BT.  The BT may be
>         expecting
>          to operate in point-to-multi-point mode.  Otherwise, you may
>         have a
>         cabling
>
>         problem.
>
>
>     Actually I've also tried to set it in PTMP mode without success.
>     The BT landline
>     seems configured in PTP BTW. Regarding the cable, it seems to work
>     because I've
>     used it to connect the Panasonic PBX which indeed work.
>
>
> The main distinguishing thing between PTP mode and PTMP mode
> with chan_dahdi/libpri is the TEI being used.  PTP mode only uses
> TEI=0.  PTMP mode uses auto-assigned TEIs.
>
> You could also have an issue with terminating resistors.  Only one side
> should have them in the circuit.  If both sides have them or neither side
> has them then you will have communication problems.

Indeed, this might be something to recheck. This might also explain the
rough minute
the BT Versatility needs to synchronize against the BRI.

Actually the openvox card is set to terminate the BRI line with the
usual 100ohm.

Cheers,
Roberto Fichera.

>
> Richard
>
>
>

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