### Description If topos is activated and kamailio responds a 407 "proxy authentication required" to a initial INVITE, INVITE received after with credentials (MD5 response in Proxy-Authorization header) is badly managed. Credentials are never validated and kamailio responds 407 again. If topoh is used instead topos all works fine and credential are validated. ### Troubleshooting #### Reproduction Always. #### SIP Traffic ### Possible Solutions I have tested with official kamailio 5.4.3-0. * **Operating System**: centos 7 (3.10.0-693.11.1.el7.x86_64) -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/2629