The 53i from Aastra offers powerful features and flexibility in a standards based, carrier-grade business IP telephone. With a sleek and elegant design and 3 line LCD display, the Aastra 53i is fully interoperable with leading IP-Telephony platforms, offering advanced XML capability to access custom applications and support for up to 9 calls simultaneously.Part of the Aastra family of IP telephones, the Aastra 53i is ideally suited for all business telephone requirements.