It's actually a common error with phone forwarding. The tone doesn't always get recognized properly. Sometimes you need to call 2-3 times until it works. If you've used up all your tries, you need to try again in 24 hours (as eBay limits you to I believe 3 or 5 tries per day). It will eventually work, but it might take you more than 1 try. I've had one account where I had to do it 5 times, another account worked the first time.
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The best advice I can give you on this is search the forums and look for the current most reliable phone forwarding or voip that currently works.
But if possible have the back up to receive a letter if possible.
My problem with this is always due to the fact I am at a disadvantage due to the fact that my location offers numbers that have a limited effectiveness when using to verify with Paypal.
So I always keep in mind that the liklehood of the phone verification failing is high so more often than not I want for the letter.
Now if you dont receive a letter you can ask PP customer support to send another. If this one fails I always shut the Paypal account as I dont use PP accounts unless I can get them fully verified.
Its like playing with dynamite without a protective suit.
Verify your location by phone .... 
