IP-PHONE-Alliance IP Phones are plug and play deployment that provides effective collaborative experience with customers and among the team. The ergonomically designed phones are equipped with all advanced features that the modern business environments demand and suitable for both small business and large office applications. It is interoperable and compatible with all the major SIP based PBX / softswitch / IMS platforms. ATS IP Phones are available from entry-level to high-end models –(wi-fi phone) with HD quality voice, contextual soft keys, phone books, DND and other features at the best price to suit your budget.