This topic has 1 reply, 2 voices, and was last updated 5 months, 1 week ago by Administrator. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts April 22, 2023 at 11:23 am #24892 mocdf2Participant Hello, Is Faxtalk compatible with VOIP providers that require user ID, password AND an “authentication ID”? We are using nextiva, which supports T.38. However, unable to register our SIP. July 3, 2023 at 8:40 pm #24960 AdministratorKeymaster it only allows for a user id and password at this time. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In