[asterisk-users] LIBPRI - video calls over ISDN

[Oscar Patricio]

Hello!

I have following scenario:

PBX <-> Asterisk <-> ISDN E1 line

The asterisk box relays calls from the E1 to the PBX and vice versa.
Additionally some outgoing calls of the PBX are being sent over VoIP
providers instead of using the E1 line.

I have one problem:

Video calls starting from the PBX and sent over the ISDN E1 line are not
working. With zaptel version 1.2.7 and libpri 1.2.3 they were working
fine. I upgraded to zaptel version 1.2.19 and libpri 1.2.5 and these
calls stopped working.

This is the error that client displays: *
H.221 negotiation timeout: Turn off and restart the system and try again.*

Is this a known problem?
Is there any configuration that must be done to allow video over ISDN?
Is any driver alteration/recompilation needed for these calls to work?

Is this merely related to libpri or do the zaptel drivers have influence
in this functionality?

Thanks in advance for your info,

Best regards,

Óscar Patrício