[Users] OpenSER and transport selection (SRV and NAPTR)

Hi, Initially I intended to submit a feature request for OpenSER functionality similar to t_relay_to_udp, t_relay_to_tcp but WITHOUT the need to specify the destination IP address and port. My reasoning was to let the new functions do exactly what t_relay() does but in addition force the DNS SRV query for a specific transport (udp, tcp, or tls). Seeing the roadmap for 1.1 I realized that NAPTR solves part of this problem. Is there already any estimation when NAPTR implementation will be available in OpenSER? I intentionally said "part of the problem" because NAPTR delegates the decision on the transport to the destination DNS. But: our own proxy might also be required to control the selected transport. It seems to me quite flexible to implement a proxy-hosted NAPTR emulation and specify the list of requested protocols, e.g. t_relay_to_transport("tls","tcp",0) specifies that t_relay should firstly generate a SRV DNS query for _sips._tcp.mydomain.org, if this fails to query for _sip._tcp.mydomain.org and then give up - if I don't want UDP. This saves one DNS query (NAPTR) and enables a proxy to control what protocols it uses for contacting the next hop. Finally, I believe that the interface to t_relay_naptr() (or whatever the naptr relaying will be called) should support selection of desired protocols, e.g. t_relay_to_naptr("tls", "tcp", "udp") where entries can be left empty to indicate that this transport is not desired. The argument order might even overrule the NAPTR response transport ranking - finally we connect and thus decide on what transport we prefer... ;) Any comments warmly welcome, best regards --Joachim