The OpenScape WLAN Phone WL4 telephones are an advance variant of telephones for mobile workplaces that use WLAN technology for transmission. These telephones can be deployed in environments with the appropriate SIPplatforms and use WLAN infrastructure which supports the dominant infrastructure standards IEEE 802.11a/b/g/n/ac. The OpenScape WLAN Phone WL4 supports now not only wireless telephony, but also messaging and alarming as options.