Headsets can be a good profit center, but they can also be a royal PITA.
They became such a support liability for us that we outsourced the task to the local Panasonic rep about 10 years ago (we get a 5% referral fee without lifting a finger).
We're completely out of the loop now and I like that.
The customer calls (or emails) the Panasonic rep who in turn makes an appointment to come over and meet them, often same day.
He brings along a sample case plus a few of the more popular models out in his van that he can "deliver & install" immediately.
He takes as much time as needed to demo each one on the customer's phone and makes sure all the settings are as they should be, instructs customer on usage, shows them how to change battery, etc.
The customer is advised of all costs up front so there's no surprises and they pay using their department's credit card so there's also no billing or payment hassles.
The guy also handles any service issues, including coming over N/C to change a battery for a Putz user.
True the customer could save about 25% by going mailorder, which is substantial considering these things go for several hundred bucks apiece, but for the level of service I don't see how we can go wrong; it keeps us out of the dang headset business.