[erlang-questions] running sample progs for MGC and MG

Maxim Treskin <>
Thu Jan 24 11:20:16 CET 2008

On 24/01/2008, J Bhanot <> wrote:
> Hi All,
> I built the stack doing following in FC 8 :
> ./configure --disable -sctp
> make all
> make install
> Now i want to test MGC and MG running examples at follwoing location
> /home/j.bhanot/Download/H.248/otp_src_R12B-0/lib/megaco/examples/simple
> i tried to execute megaco_simple_mgc.erl
> following these commands:
> erl -pa ../../../megaco/ebin -s megaco_filter -s megaco
> %%   megaco_simple_mgc:start().
> but getting the error :
> 1> Application initialization failed: no display name and no $DISPLAY
> environment variable
> Error in startup script: no display name and no $DISPLAY environment
> variable
> Question1 : what should the value with which env value DISPLAY be set

DISPLAY is environment variable, which contains address and display number
of your X server. Megaco sample progs have some GUI to trace megaco
messages. It seems that you ran stack not in X environment, or under another

Question2: these sample applications are made in erlang...is it possible to
> use c/c++ or some other language to use APIs/Functionalities of Megaco stack

There is erl_interface library to interact between erlang node and C/C++
applications, but it is necessary to run one erlang node for this.

--- Maxim 'Zert' Treskin
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