Once you got everything setup and working, make a call to your favorite US person, and ask them to make a call to you. If they can hear you giving them your instructions, then your outgoing services are working. If your device rings when they called you, answer the phone, and make sure everything works there. Ask them to call you again, and leave a voicemail on your voicemail box. Some SIP? phones will have a blinking light when you have voicemail (assuming you set it up properly). You can then call into your voicemail, and check your message. If you don’t want to dial *86, then dial your phone number. If you having problems with your service, submit a support ticket.
Once you are confident that everything is working fine, you can now provide this number to anyone that wants your US number. If you have your own website, I would recommend that you place the number on the contact page of your site unless you want the number to be private. If you want the number to be private, then just give the number to only those that you want them to have the number. Keep in mind, your international format for writing the number will be +1 and 10 digits following the +1. Usually people will place spaces or symbols after the 3rd and 6th digits, but this is just to make things simpler to read. ITU? Standards implies for no spaces periods, dashes, or parenthesis.