As others have said you want to make this as easy as possible on the interviewer - throwing unnecessary obstacles in the way is never a good strategy IMO.
Why not simply explain that you're going to be away on vacation and ask them what their preferred method would be? Give them some options.
is it correct to ask the interviewer to call on my international number for the interview.
I'd be wary of this - a phone interview can be a relatively lengthy call and depending on what telephony solution the interviewing company has this could get very expensive for them very quickly!