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

J Bhanot j.bhanot@REDACTED
Fri Jan 25 07:18:33 CET 2008

Hi ,

I am having some startup trouble here understanding the exact way this 
stack works...

Few queries that I have :

1. Does this stack gives the functionality/instance of MGC and MG or I 
would need it separately (think satck will be providing that)

2. In the user guide for Megaco, in order to prepare MGC to recieve 
messages follwoing needs to ne done

Start the Megaco application. (how to do that -- configure-build-install 
the OTP stack then run follwoing command - erl -pa ../../../megaco/ebin -s 
megaco_filter -s megaco)....am just in the process of learning Erlang as 
well (don't understand the erlang syntax as of now but will learn 
:-)......another question - how to make megaco_filter off so that megaco 
messages can be seen on console)
Start the MGC user. This may either be done explicitly with 
megaco:start_user/2 or implicitly by providing the -megaco users 
configuration parameter. (how to do that - once I run the above command, i 
get erlang shell - 1>...then type megaco:start_user/2.....that should make 
my MGC up and running ..listeniing at some port)
Initiate the transport service and provide it with a receive handle 
obtained from megaco:user_info/2.(How to do that)...

Please correct me if my understanding is correct..
Please forgive me if my quesetions appear to be a bit too novice..
Thanking in anticipation...

"Maxim Treskin" <zerthurd@REDACTED> 
01/24/2008 04:25 PM

"J Bhanot" <j.bhanot@REDACTED>
erlang-questions@REDACTED, megaco@REDACTED
Re: [erlang-questions] running sample progs for MGC and MG

On 24/01/2008, J Bhanot <j.bhanot@REDACTED> wrote:

Hi Maxim, 

I was using putty from my local windows machine to connect to linux server 
and then running this sample application..... 

but when i ran this script from linux sever itself (FC8)....it did show 

now it want to display GUI from my local windows machine running this appl 
on putty...for this i am trying to download an interface b/w linux and 
windows i.e 


hoping that it would open the GUI from my local windows m/c....

You have two way:
 1) Install X server on your windows machine, start it, then set DISPLAY 
variable on linux station to "your_windows_addr:x_display", where 
your_windows_addr is network address of machine and x_display is display 
number of X server 
 2) Do not run megaco_filter process. In this case you can see megaco 
messages on console, not in GUI.

Second question is that -  I am looking into erl_interface library 

now when you say atleast one erlang node should be running ...do you mean 
that anyways i will have to use Erlang in building some application ( 
Start Media Gateway Controller) and then if i want to start Media Gateway 
....i can use my C application to start it and then making MG communicate 
with MGW via erl_interface library using C....

At least one erlang node should be started for MGC and one node for each 
MG. Also you must write pice of code in erlang to handle megaco messages. 
The easiest way is learn Erlang OTP, and write whole application on this 
platform. You can write low-level part of application on C/C++, but it is 
impossible to write high-level part, megaco messaging, on other language, 
not Erlang. 

Actually, i am bit hazy about this at this moment... 

Could you kindly throw more light on that... 

Appreciate your help... 

Many Thanks, 

Maxim 'Zert' Treskin

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