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#Freeswitch install module software

This is true for all modules, regardless of the exported interfaces.SWITCH_MODULE_DEFINITION(mod_dummy, mod_dummy_shutdown, mod_dummy_run, mod_dummy_load).SWITCH_MODULE_LOAD_FUNCTION(mod_dummy_load).SWITCH_MODULE_RUNTIME_FUNCTION(mod_dummy_run).SWITCH_MODULE_SHUTDOWN_FUNCTION(mod_dummy_shutdown).Module loading and registering relies on gcc constructor-destructor attributes.Call ast_unregister_application in unload_module().Your app_exec function will be called if the app is called from the dial plan.Call ast_register_application_xml() on in load_module() to register app_exec.AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, “Desc”).Define static int load_module() and static int unload_module().static int app_exec(struct ast_channel *c, const char *data).More interfaces defined in src/include/switch_module_interfaces.h.API (switch_api_interface_t -> no exact match).Application (switch_application_interface_t -> ast_app).Files (switch_file_interface_t -> ast_format).Codec (switch_codec_interface_t -> ast_translator).Endpoints (switch_endpoint_interface_t -> ast_channel_tech).You must register your interfaces on module load.The core loads the shared object on startup or on demand.You allocate memory from the process heap directly.The initial leg thread is re-used for the outgoing leg.struct ast_chan is the call structure.You allocate memory using the session memory pool.Each session has its own state machine thread.switch_core_session_t is the call structure.call switch_core_session_thread_launch() ISDN: SETUP (new thread) mod_openzap State machine routing state execute state Bridge Application switch_ivr_originate() ISDN: CONNECT (new thread) loop Handling state changes State machine Media Exchange loop Handling state changes.FreeSWITCH making a call bridge between SIP and PRI.call ast_pbx_start() (new thread) PBX core ISDN: SETUP chan_zap ast_request -> ast_call() loop nf calls Dial() application ast_waitfor() ISDN: CONNECT ast_bridge_call() ast_channel_bridge() Media Exchange PBX core.

Asterisk making a call bridge between SIP and PRI.

How a two-leg call is handled? Routing Incoming leg Outgoing leg.

Incoming leg audio Outgoing leg audio FreeSWITCH Incoming leg dtmf Outgoing leg dtmf Incoming leg signaling Outgoing leg signaling Different data structures for signaling, audio, dtmf etc.

DTMF is handled through the DTMF queue.

Signaling is handled through switch_core_session_message_t.

And more … Asterisk Incoming leg frames Outgoing leg frames Asterisk frames (signaling, audio, dtmf, video, fax).

Extension, context and ast_callerid instead of caller profile.

How a call leg is abstracted? Asterisk struct ast_channel FreeSWITCH switch_core_session_t.

How a call leg is abstracted? Asterisk Incoming call FreeSWITCH.

Core APIs Module Application Module interfaces

The core uses the module interfaces function pointers.

The core provides APIs to module writers.

Apache (loggers, generators, filters, mappers).

PHP, Python and PERL interpreters (extensions).

Linux kernel (character devices, block devices, filesystems etc).

#Freeswitch install module software

Moises Silva Software Developer Sangoma Technologies

FreeSWITCH modules forAsterisk developers.