It actually can't be done, the setting is greyed out because it is intended for a dual fax line configuration, which if you have it, that option becomes available so you can make one send and one receive.
Good afternoon everyone,
I have a customer with a Versalink C405 that wants to be able to set it up for sending faxing but not recieveing. they have two machince connected to the same line and want to use one for send/recieve and the other for send only so they don't get in each other's way. I can see the setting when I log into the web interface but it is grayed out even when logged in as the Admin.
Any ideas would be super helpful.