I will go out of my way to avoid calling someone. I just can't deal with it. After a call I feel like I need a shower cause I'm sweaty and exhausted. I'd rather search for contact information for an hour and wait for mail reply than do a call for 5 minutes.
Calling is OK for me.. Getting called now? That's hell. Totally no control over sensory input (that infernal ringing noise), no control over who or when or what they want?
I turned my phone to vibrate because the constant notification noise was driving me crazy. Then the vibrating drove me crazy. I haven't taken my phone off silent since. I have a smart watch that only vibrates for 3 things so I don't have to deal with all the extra interference.
It's not proper to autism per se. It's the same situation as with answering to an email. People will be anxious, but will do it in a reasonable amount of time. Autist on the other hand will take ages to answer if they will answer at all.
The amount of anxiety in autists as well as the consequences are higher.
This is the same for visiting family for me. The build up is awful, then I have an okay time, then I'm happy to be going home but absolutely fucking knackered.