Which SIP providers provide a free number with extension dialing?

Question

SIP

Those. so that the provider has a common number that you can call and then dial the subscriber's number. I think many people provide this service for free.
Thank you in advance.

Answer 1

Many provide, I wrote about them ( habrahabr.ru/post/95080/ ) earlier.
If you find someone else, then whistle, I will gladly add to my list ...

Answer 2

zadarma.com
and, in different countries.

Answer 3

If you need to call from abroad, then SIP Broker provides the largest pool of incoming numbers around the world, you just need to have a SIP account somewhere, and it's absolutely free.