Enter SIP Server on phone interface

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I have Yealink T20-P phone.

I connected the phone port "internet" to router, and power to powerpack.

I pressed "ok" to view IP address.

When I enter IP address on browser, browser always times out. Does anyone know why this can happen???

So anyway I am entering settings on phone itself.

I enter all details correctly under Settings>advanced>accounts

I must enter "SIP Server". BUT I can only enter numbers, not letters here.

My SIP Domain:Port is sipr.provider.com:56060

So I entered 56060, because I cannot enter letters.

All details are entered. But the result is "Register Failed."

Can anyone suggest why?

Thanks very much.