Hi, I'm currently trying to setup a SER with rtpproxy as a full SIP router with IPv4 and IPv6 clients. After some hours of work I think I've understood the basics and I've hit my first problem. According to the examples floating around (and also according to my own tests) you need to give force_rtp_proxy different arguments depending on the AFI of both sides of the RTP stream. IPv4 -> IPv4 force_rtp_proxy("FAII") (or omit for direct media) IPv4 -> IPv6 force_rtp_proxy("FAIE") IPv6 -> IPv4 force_rtp_proxy("FAEI") IPv6 -> IPv6 force_rtp_proxy("FAEE") (or omit for direct media) while it is pretty easy to tell the AFI of the caller with if (af == inet6) as written in the examples, it seems to be impossible to tell the AFI of the called side in the route block (since DNS lookups appear to be done after t_relay(), and there might even be a fallback, haven't tested that). In static configurations you might be able to create a list of v4/v6 peers, but with ENUM or similar games you're seriously screwed. Anyone having an idea how to solve that? Thanks Bernhard