[asterisk-users] LIBPRI - video calls over ISDN

[Oscar Patricio]

Steve Davies wrote:
> On 8/9/07, Oscar Patricio <oscar at iportalmais.pt> wrote:
>   
>> 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,
>>     
>
> Hi,
>
> Sorry, this is not an answer to your question, but I would be REALLY
> interested how you ever made that work at-all. It there a FAQ you
> could point me at? How do you initiate an H.221 ISDN call via Zaptel
> for example?
>
> I have never heard of this feature, so perhaps this is some external
> Zaptel/Asterisk patch that was in your 1.2.7 build that is not in your
> new build?
>
> Thanks,
> Steve
>   
Hi Steve!

Well, I never did anything special. I just compiled the zaptel drivers
normally and patched them with the Sangoma drivers. The calls worked
immediately. Keep in mind that they came from the PBX through the
asterisk and to the PSTN. So the asterisk box was just "relaying" the
call over ISDN. I did the exact same thing for the new version of
drivers but surprisingly the calls stopped working.

I never installed anything special or followed any manual to get this to
work. It just worked.

Best regards,

Óscar Patrício

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