*
* @param tunnel configuration object
*/
-const char *linphone_tunnel_config_get_host(LinphoneTunnelConfig *tunnel);
+const char *linphone_tunnel_config_get_host(const LinphoneTunnelConfig *tunnel);
/**
* Set tls port of server.
*
* @param tunnel configuration object
*/
-int linphone_tunnel_config_get_port(LinphoneTunnelConfig *tunnel);
+int linphone_tunnel_config_get_port(const LinphoneTunnelConfig *tunnel);
/**
* Set the remote port on the tunnel server side used to test udp reachability.
*
* @param tunnel configuration object
*/
-int linphone_tunnel_config_get_remote_udp_mirror_port(LinphoneTunnelConfig *tunnel);
+int linphone_tunnel_config_get_remote_udp_mirror_port(const LinphoneTunnelConfig *tunnel);
/**
* Set the udp packet round trip delay in ms for a tunnel configuration.
*
* @param tunnel configuration object
*/
-int linphone_tunnel_config_get_delay(LinphoneTunnelConfig *tunnel);
+int linphone_tunnel_config_get_delay(const LinphoneTunnelConfig *tunnel);
/**
* Destroy a tunnel configuration