Introduction to chan_sip.c:19635 send_check_user_failure_response

This is a notice message that is generated by the chan_sip.c module when it is unable to verify a device for INVITE requests. Specifically, the message indicates that the device <sip:4001@mami.sn>;tag=cb1f865c8c4b4c0c8bb6cfa76a744569 could not be verified, with an error code of -2.

Possible Causes

There are several potential causes for this error, including:

• Incorrect or invalid configuration of the SIP device or server
• Network connectivity problems between the device and server
• Authentication issues, such as incorrect credentials or blocked IP addresses

Troubleshooting Steps

To diagnose and resolve this issue, you can try the following steps:

1. Check the configuration settings for the device and server to ensure they are correct and match each other.
2. Verify that there are no network connectivity issues by checking for any system logs or error messages related to network connectivity.
3. Review authentication settings and verify that the correct username and password are being used. You may also need to check for any blocked IP addresses that may be preventing access to the server.
4. Check the SIP responses to see if there are any further error messages or codes that can help identify the problem.

By taking these steps and reviewing any additional information that may be available, you can better understand and resolve the issue with the chan_sip.c module.