A7: Yes.
Akuvox R20, R26, R27, R28, R29, IT80, IT82, IT83, C313, C315 and C317 support to work with Contrl4 devices.
Its driver can be downloaded from the link - https://mega.nz/#F!Y6AgRAKb!P0wNXEp37vaMzLG-cM0VBQ
Related manual can be downloaded from the link - https://mega.nz/#!ljIVQQjI!SUU2bOLuANBYc49SzSQ7aYkt8n9jT_VEpMTfq0g-alM
As for related firmware, please contact our technical engineers.
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