Hello, perhaps someone can answer my question. We have a very old Onyx VS system. We would like to switch to VOIP/SIP service from our cable provider. I was told by one technician that the ONYX may not work with this service (cable modem). Another tech who wanted to hook us up through his service said (sarcasticly) that even systems from the 15th century could work with cable. I do not want to cancel phone service/set up installation if it will not work. Thank you for any help you can give me.
Bill