This is true. I will give the caveat, though, that some of these are vendor-locked. Meaning: you can't easily use them with 3rd party SIP providers. So, just b

This is true. I will give the caveat, though, that some of these are vendor-locked. Meaning: you can't easily use them with 3rd party SIP providers. So, just be aware of this and do your homework on specific brands/models before purchasing to ensure you'll get something that will work for you.