Hi all! I'm newie in this mailing list and I am working with SER at this momen in a project. However I have a doubt I would like to clarify. Does anyone know if there is a way to perform SIP Proxy to SIP Proxy authentication (I mean in SIP protocol in general)? If a SIP proxy receives an INVITE from another SIP Proxy, how does the proxy which receives the INVITE that the originating proxy can be trusted? I have read something about TLS but I took it from an article of 2003... Which is the most used method nowadays? Thank you very much for your attentio Regards Victor