NEC iPBX Versions 3C/SV8300/iS3000
From Zenitel Wiki
The INCA Stations and Turbine Stations have successfully passed interoperability tests with NEC iPBX Versions 3C/SV8300/iS3000.
Download the test report here: NEC_Zenitel_SIP_EndPoint_Test_Cases_rel._2.1.pdf