I have a customer with an existing IP Office running R9.
They are wanting to upgrade to the latest version and add softclients. Ideally (so they've told me), they would replace all of the desk phones (currently 9608's) with the softphones. I have never dealt with One-X and IP Office. How reliable is the softphone? Does it offer most of the features of the deskphones? How about remote workers? If the user has VPN connectivity to the office, will they be able to use their One-X client?

My initial quote to them included replacing the 9608's with J179 phones. They thought the price was too high. Talking about 20 phones. They are also looking at going to Teams calling, so I'm sure that's where the idea of going to softphones is coming from.