[Users] t_relay does not follow RFC3263 "Locating SIP Servers"

[Juha Heinanen]

Franz Edler writes:

 > Meanwhile I verified in my tests that t_relay only does an SRV lookup
 > towards _sip._udp.<domain> and no NAPTR lookup as I expected. 
 > That means if I want to use TCP between two SIP servers I have to use
 > t_relay_to_tcp(ip, port) explicitly in my configuration file and cannot use
 > DNS data to control transport protocol selection.

without NAPTR support, perhaps easiest solution would be a configuration
parameter telling which transport (udp or tcp) is the preferred one when
doing the SRV query and if no reply is got, then the other transport
would be queried.

-- juha