TelTel is a SIP provider that includes a proprietary SIP client that only works under Windows. The client itself has allot of features such as desktop sharing, presence, and chat capabilities. The problem is, you can’t use the service on anything but a Windows box. TelTel does not include instructions on their website to configure third party clients.
After some searching I found the settings:
Username: user_AT_email.com | subsitute the @ symbol with _AT_
Authorization username: firstname.lastname@example.org | you are using the @ sign and not _AT_
I have tested these settings with XLite and they work great!