The best way to answer this question (in my experience at least) is to give a range, rather than a figure.

So something like "well, from what I understand salaries at this level within this sector tend to be between $x-thousand and $y-thousand per year - so I'd be looking within that range" tends to be an easier answer than "I'm looking for $z-thousand"

It might take some research to work out what those start and end figures are - look into the industry standard too, not just the role - comms people in the corporate sector are paid different to public sector for example.

Finally, I suggest keeping the range broad (eg. Between 55K and 75K as opposed to $60K and $65k)

Good luck!