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AT&T signed on 10 companies which will use its labs to test the compatibility of IP telephony technologies. IP telephony allows users to make phone calls over the Internet. The AT&T Global IP Telephony Interoperability Labs are located in Florham Park, New Jersey, and San Jose, California. Companies participating in the tests include Clarent, Delta Three, Ericsson, GRIC Communications, Lucent Technologies, Siemens, 3Com, @Home, and VocalTec.