[Freeswitch-dev] Issue while creating a session for an incoming call in managed application

Papineni, Suneel SPapineni at enghouse.com
Wed Jun 13 21:03:42 MSD 2012

Hi Michael,

Thanks for your quick reply.

I tried same function in C code and it worked fine.

Also as you said, I tried to debug and the problem appears to be at "SWIGEXPORT void * SWIGSTDCALL CSharp_switch_core_session_request_uuid(void * jarg1, int jarg2, unsigned long jarg3, void * jarg4, char * jarg5){ }" function present in "freeswitch_wrap.2010.cxx" file in "mod_managed" project.
In this function exception is thrown from "return jresult;" line. In this jarg4 shown as <undefined value> and other parameters are having values (in debug mode). I was unable to debug line by line in this function.

I was unable to figure out why it is throwing this error at this function. Will it comes if interface does not exist or interface config is not loaded properly?

Thanks & Regards

From: freeswitch-dev-bounces at lists.freeswitch.org [mailto:freeswitch-dev-bounces at lists.freeswitch.org] On Behalf Of Michael Giagnocavo
Sent: 13 June 2012 16:34
To: freeswitch-dev at lists.freeswitch.org
Subject: Re: [Freeswitch-dev] Issue while creating a session for an incoming call in managed application

I suggest writing the same code in C, just to troubleshoot and make sure you're calling the switch_core_session_request_uuid function properly. That exception means "access violation" aka segfault.

You can also turn on the debugger and step into the native code and see where it's failing. (I'm not sure if you break on exception if it'll show you.) Basically, you have to troubleshoot it like a normal C app.


From: freeswitch-dev-bounces at lists.freeswitch.org<mailto:freeswitch-dev-bounces at lists.freeswitch.org> [mailto:freeswitch-dev-bounces at lists.freeswitch.org]<mailto:[mailto:freeswitch-dev-bounces at lists.freeswitch.org]> On Behalf Of Papineni, Suneel
Sent: Wednesday, June 13, 2012 9:29 AM
To: freeswitch-dev at lists.freeswitch.org<mailto:freeswitch-dev at lists.freeswitch.org>
Subject: [Freeswitch-dev] Issue while creating a session for an incoming call in managed application


I am having a third party VoIP client which exposes API in .NET to communicate with my application. I want to use this client as an endpoint in Freeswitch (like how it is implemented in "mod_skypopen" module), so that calls coming to this client can be handled at Freeswitch and (if required) bridge calls to clients connected to Freeswitch.

To implement this, I have written a managed module in which "ILoadNotificationPlugin" is implemented where config (client's interface config) is loaded.

When there is an incoming call (ringing state) to the client, I get handle in managed module and trying to establish a session at freeswitch. While doing this I am getting exception as "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
Here is the code that I am using... Could someone guide me if I am doing this correctly.

Note: I am following "mod_skypopen" as an example...

public static int new_inbound_channel(private_object pobject)
                                SWIGTYPE_p_switch_core_session session = null;
                                SWIGTYPE_p_switch_channel channel = null;
                                switch_endpoint_interface intf = new switch_endpoint_interface();
                                intf.interface_name = "NET_interface";
                                intf.io_routines = io_routines;
                                intf.state_handler = state_handlers;
                                Api fsApi = new Api();
                                String uuid = fsApi.ExecuteString("create_uuid");
                                                session = freeswitch.switch_core_session_request_uuid(intf, switch_call_direction_t.SWITCH_CALL_DIRECTION_INBOUND, 0, null, uuid);  //I am getting the above issue here....
                                                if (session != null)
                                                                freeswitch.switch_core_session_add_stream(session, null);
                                                                channel = freeswitch.switch_core_session_get_channel(session);
                                                                if (channel == null)
                                                                                return 0;
                                                                freeswitch.switch_channel_set_variable_name_printf(channel, "waste", "false");

                                                                pobject.caller_profile = freeswitch.switch_caller_profile_new(freeswitch.switch_core_session_get_pool(session), "NETClient", "dialplan", "callid_name", "callid_number", null, null, null, null, "mod_netclient", "context", "destination");
                                                                if (pobject.caller_profile != null)
                                                                                freeswitch.switch_channel_set_name(channel, "name");
                                                                                freeswitch.switch_channel_set_caller_profile(channel, pobject.caller_profile);
                                                                freeswitch.switch_channel_set_state_flag(channel, switch_channel_flag_t.CF_GEN_RINGBACK);
                                                                switch_status_t session_status = freeswitch.switch_core_session_thread_launch(session);
                                                                if (session_status != switch_status_t.SWITCH_STATUS_SUCCESS)
                                                                                return 0;
                                catch (Exception exp)
                                                string expstring = exp.Message;
                                return 0;

Thanks & Regards
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