If your SIP device is not registering, what is a step to check?

Checking whether the logon/password is spelled correctly is vital when troubleshooting registration issues with a SIP device. This step is essential because any error in the username or password can prevent the device from successfully authenticating with the SIP server. Registration requires precise entry of credentials, and even a minor mistake, such as a typo or a mismatch in case sensitivity, can lead to failure in connecting to the SIP service.

Verifying the correctness of these credentials helps narrow down the potential causes of the registration issue, focusing on authentication as a primary factor. This is often the first and simplest troubleshooting step to take, as it directly addresses the core need for registration: accurate identification of the user to the SIP server.