FS-10880: [mod_sofia] SIP INFO DTMF method not working on b-leg #resolve

src/mod/endpoints/mod_sofia/mod_sofia.c

@@ -1256,6 +1256,8 @@ static switch_status_t sofia_send_dtmf(switch_core_session_t *session, const swi
 	tech_pvt = (private_object_t *) switch_core_session_get_private(session);
 	switch_assert(tech_pvt != NULL);
 
+	switch_core_media_check_dtmf_type(session);
+	
 	dtmf_type = tech_pvt->mparams.dtmf_type;
 
 	/* We only can send INFO when we have no media */