I don't mind so much answering phones, I used to answer studio request lines all the time and probably would never have dated if not for the chance to chat girls up on the phone before meeting them face to face - but I was in control of that, I answered when I felt like it (it didn't ring, just blinked a light), ignored it when I didn't feel like it and if someone got rude with me, I was free to hang up on them and put the line on hold for a while.
I did do other jobs involving phones. One where I had to answer calls and take phone orders, I hated it, but the real stress there was from noise around me more than talking to idiot customers.
One where I had to call previous customers and invite them to set new appointments - I wasn't selling them anything, and they had done business with the company before, so I was just reminding them to come in again and setting a date - if they said no, I could say "thanks for your time" and let them go. Those people were generally friendly and almost never got mad or rude.
Then there was a job in actual Telemarketing, where I was given a long list of random phone numbers and had to sit for hours, calling one after another, reading a high-pressure sales pitch off index cards and I was not allowed to end the call until I made a sale, or the other person got mad and hung up on me. I did that for less than two weeks and reached the point where I had to quit or commit suicide. I'm pretty sure that was the most miserable job I ever had in more than 30 years.
It just isn't in most autistic peoples' nature to pressure strangers into doing things. Well, if you don't count stalking them and begging them to love us. 
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"I don't mean to sound bitter, cynical or cruel - but I am, so that's how it comes out." - Bill Hicks