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There is a guide from Cisco saying what phones are supported by TAPI https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/tapi_dev/12_0_1/CUCM_BK_C6F20193_00_tapi-developers-guide_1201/CUCM_BK_C6F20193_00_tapi-developers-guide_1201_appendix_01100...