Well, in general, it is true that in general traveling pre-sales engineers or integration consultants usually get a premium over most devs. But not knowing specifics it is hard to tell for your situation. If you are < 5 years of experience I'd say you could easily expect a 10%-20% reduction, if you are 10+ years, it is weird cause it can actually go either way, either a major reduction or a pretty straight across conversion, I've seen both.
I'd say if you are happy with the company and just want to stop traveling, then take the 10% pay cut and be done, you'll probably make that up on being in one place for a year. :) Plus you will likely be able to grow your salary still, so probably not a big deal overall. Also, you may want to check too, most of the time consultants don't get into the same bonus pools that FTE devs do, so that might also be a difference either way to be clear. Same with other benefits, so just make sure you are comparing all the compensation elements and not just pay (I would think you are, but just a reminder) -- a lot of times health insurance is different, generally you pay less as a dev for your portion than you would as a consultant (primarily because it costs the company more to insure the full time traveling employee).
If you feel the company is low balling you for some reason, take a stand and hold the line, but just be prepared they may say then they have no position for you.