is-phone is bridging the gap

is-phone is fully interoperable with the open source products Asterisk (Astimax, Digium, Fonality), SIP Express Router and IP PBX from leading telephony infrastructure suppliers like 3Com, Alcatel, Avaya, Cisco, Nortel, Siemens or VocalTec as well as Internet Telephone Service Provider (ITSP).

Official Certifications

    Avaya Certification logo           Siemens HiPath Ready logo

Interoperability Overview

is-phone SIP platform compatibility graphic