const char *linphone_call_get_refer_to(const LinphoneCall *call);
bool_t linphone_call_has_transfer_pending(const LinphoneCall *call);
int linphone_call_get_duration(const LinphoneCall *call);
-const LinphoneCallParams linphone_call_get_current_params(const LinphoneCall *call);
+LinphoneCallParams linphone_call_get_current_params(const LinphoneCall *call);
void linphone_call_enable_camera(LinphoneCall *lc, bool_t enabled);
bool_t linphone_call_camera_enabled(const LinphoneCall *lc);
LinphoneError linphone_call_get_error(const LinphoneCall *call);