Viking E-20-IP Phone Viking E-20-IP Surface mount the Viking E-20-IP entry phone at any critical entry to your building or premises. The phone can be surface mounted to a single gang box, electrical junction box, wall or flat-sided post. Additional caulking or material may be required for installation on rough or uneven surfaces. Up to five numbers can be programmed into the Viking E-20-IP phone, either from a touch tone phone or PC. This entry phone is compatible with certain third-party, SIP-based phone systems. A single Ethernet cable can provide both telephony services and power via PoE to the phone.