turn on echo cancellation and turn it off in mg_notify

libs/freetdm/mod_freetdm/tdm.c

@@ -40,6 +40,8 @@ void ctdm_init(switch_loadable_module_interface_t *module_interface);
 #define kCHAN_ID "chan"
 #define kSPAN_NAME "span_name"
 #define kPREBUFFER_LEN "prebuffer_len"
+#define kECHOCANCEL "echo_cancel"
+
 
 static struct {
     switch_memory_pool_t *pool;
@@ -374,6 +376,10 @@ static switch_call_cause_t channel_outgoing_channel(switch_core_session_t *sessi
 		return SWITCH_STATUS_GENERR;        
     }
 
+    if (FTDM_SUCCESS != ftdm_channel_command(tech_pvt->ftdm_channel, FTDM_COMMAND_ENABLE_ECHOCANCEL, NULL)) {
+		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Failed to set enable echo cancellation.\n");
+	}
+    
 	switch(codec) {
         case FTDM_CODEC_ULAW:
 		{
@@ -477,6 +483,10 @@ static switch_status_t channel_on_destroy(switch_core_session_t *session)
     
  	if ((tech_pvt = switch_core_session_get_private(session))) {
 	
+		if (FTDM_SUCCESS != ftdm_channel_command(tech_pvt->ftdm_channel, FTDM_COMMAND_ENABLE_ECHOCANCEL, NULL)) {
+			switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_WARNING, "Failed to enable echo cancellation.\n");
+		}
+        
 		if (tech_pvt->read_codec.implementation) {
 			switch_core_codec_destroy(&tech_pvt->read_codec);
 		}
@@ -639,7 +649,8 @@ static switch_status_t channel_receive_event(switch_core_session_t *session, swi
     const char *command = switch_event_get_header(event, "command");
     ctdm_private_t *tech_pvt = switch_core_session_get_private(session);
     
-    if (!zstr(command) && !strcasecmp(command, kPREBUFFER_LEN)) {
+    if (!zstr(command)) {
+		if (!strcasecmp(command, kPREBUFFER_LEN)) {
 	        const char *szval = switch_event_get_header(event, kPREBUFFER_LEN);
 	        int val = !zstr(szval) ? atoi(szval) : 0;
         
@@ -650,8 +661,15 @@ static switch_status_t channel_receive_event(switch_core_session_t *session, swi
 	                return SWITCH_STATUS_GENERR;        
 	            }
 	        }
-    }
+		} else if (!strcasecmp(command, kECHOCANCEL)) {
+			const char *szval = switch_event_get_header(event, kECHOCANCEL);
+			int enabled = !!switch_true(szval);
 			
+			if (FTDM_SUCCESS != ftdm_channel_command(tech_pvt->ftdm_channel, enabled ? FTDM_COMMAND_ENABLE_ECHOCANCEL : FTDM_COMMAND_DISABLE_ECHOCANCEL, NULL)) {
+                switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Failed to %s echo cancellation.\n", enable ? "enable" : "disable");
+			}
+		}
+    }
     
     return SWITCH_STATUS_SUCCESS;
 }

src/mod/endpoints/mod_media_gateway/media_gateway.c

@@ -761,6 +761,34 @@ void mg_term_set_pre_buffer_size(mg_termination_t *term, int newval)
     switch_event_destroy(&event);
 }
 
+
+void mg_term_set_ec(mg_termination_t *term, int enable) 
+{
+    switch_event_t *event = NULL, *event2 = NULL;
+    switch_core_session_t *session, *session2;
+    
+    if (!zstr(term->uuid) && (session = switch_core_session_locate(term->uuid))) {
+        switch_event_create(&event, SWITCH_EVENT_CLONE);
+        
+        switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "command", kECHOCANCEL);
+        switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, kECHOCANCEL, enable ? "true" : "false");
+    
+        /* Propagate event to bridged session if there is one */
+        if (switch_core_session_get_partner(session, &session2) == SWITCH_STATUS_SUCCESS) {
+            switch_event_dup(&event2, event);
+            switch_core_session_receive_event(session2, &event2);
+            switch_core_session_rwunlock(session2);
+        }
+        
+        switch_core_session_receive_event(session, &event);
+        switch_core_session_rwunlock(session);
+        
+        switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Sent echo_cancel event to [%s] to [%s]\n", term->uuid, enable ? "enable" : "disable");
+    }
+    
+    switch_event_destroy(&event);
+}
+
 /* For Emacs:
  * Local Variables:
  * mode:c

src/mod/endpoints/mod_media_gateway/mod_media_gateway.c

@@ -39,9 +39,13 @@ SWITCH_STANDARD_APP(mg_notify_function)
     if (!strcmp(data, "cng")) {
         mg_send_t38_cng_notify(term->profile, term->name);
         switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Sent CNG notify\n");
+		/* Disable echo cancellation */
+		mg_term_set_ec(term, 0);
     } else if (!strcmp(data, "ced")) {
 		mg_send_t38_ans_notify(term->profile, term->name);
 		switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "Sent CED notify\n");
+		/* Disable echo cancellation */
+		mg_term_set_ec(term, 0);
     }
 }
 

src/mod/endpoints/mod_media_gateway/mod_media_gateway.h

@@ -88,6 +88,7 @@ typedef struct mg_context_s mg_context_t;
 #define kCHAN_ID "chan"
 #define kSPAN_NAME "span_name"
 #define kPREBUFFER_LEN "prebuffer_len"
+#define kECHOCANCEL "echo_cancel"
 
 typedef struct mg_termination_s mg_termination_t;
 
@@ -269,6 +270,7 @@ switch_status_t megaco_profile_destroy(megaco_profile_t **profile);
 uint32_t mg_rtp_request_id(megaco_profile_t *profile);
 void mg_rtp_release_id(megaco_profile_t *profile, uint32_t id);
 void mg_term_set_pre_buffer_size(mg_termination_t *term, int newval);
+void mg_term_set_ec(mg_termination_t *term, int enable);
 
 mg_context_t *megaco_get_context(megaco_profile_t *profile, uint32_t context_id);
 mg_context_t *megaco_choose_context(megaco_profile_t *profile);