HOW TO CONFIGURE A SIP PHONE
The minimum information which must be put in every SIP phone is your SIP address (like sip:) and the password you have chosen during subscription. Some phones require also outbound proxy address and registrar address: use sip.iptel.org then. If port number is asked, use the default 5060. Unfortunately many SIP phones have way too many other configuration parameters whose description is beyond this brief FAQ.
HOW TO TERMINATE MY CALLS IN PSTN?
iptel.org is not offering PSTN termination services. However, you may use a third-party SIP account with PSTN termination and use it for terminating calls to numerical destinations prefixed with the plus sign. Set it up in your profile under "My Account - Other".
WHAT IF SOME SIP EQUIPMENT ONLY HAS NUMERICAL KEYBOARD
Use then a numerical alias to your SIP address. You will find it in the "My Account - General" webpage.
HOW CAN I TEST THE SERVICE IS WORKING FOR ME
Call sip: for an audio announcement, or sip: to hear yourself.
I HAVE NOT RECEIVED AN ACCOUNT SETUP CONFIRMATION EMAIL
Most likely you included a wrong email address or your email server requires a confirmation from a new email address. Unfortunately our service does not handle such requests.