FS-10293: Fix regression from FS-9638 causing 1 way audio on FreeTDM Calls

libs/freetdm/mod_freetdm/mod_freetdm.c

@@ -1718,6 +1718,8 @@ static switch_call_cause_t channel_outgoing_channel(switch_core_session_t *sessi
 
 		our_chan = switch_core_session_get_channel(*new_session);
 
+		switch_channel_set_flag(our_chan, CF_AUDIO);
+
 		/* Figure out if there is a native bridge requested through SIP x headers */
 		if (network_peer_uuid) {
 			switch_core_session_t *network_peer = switch_core_session_locate(network_peer_uuid);
@@ -1847,6 +1849,8 @@ ftdm_status_t ftdm_channel_from_event(ftdm_sigmsg_t *sigmsg, switch_core_session
 		return FTDM_FAIL;
 	}
 
+	switch_channel_set_flag(channel, CF_AUDIO);
+
 	channel_caller_data->collected[0] = '\0';
 
 	if (zstr(channel_caller_data->cid_name)) {

libs/freetdm/mod_freetdm/tdm.c

@@ -367,6 +367,8 @@ static switch_call_cause_t channel_outgoing_channel(switch_core_session_t *sessi
         goto fail;
     }
 
+    switch_channel_set_flag(channel, CF_AUDIO);
+    
     span = ftdm_channel_get_span(chan);
     
     tech_pvt = switch_core_session_alloc(*new_session, sizeof *tech_pvt);