Reference:Administration/Relay/VOIP/GW
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SIP specific stuff
domain/realm
normally, it is sufficiant to specify domain/realm. the DNS is queried then with this name to obtain the DNS SRV entry _sip._tcp or _sip._udp, respectively. this may result in a list of service addresses, ordered by priority and weight.
if no SRV entry is found, then the configured domain is queried as a host name.
if there is a Server Adress configured, then no DNS SRV lookup is done and the address provided is used. The domain/realm is used only for SIP URIs. If there is no domain/realm, the Server Address is used for building SIP URIs.
The two Server Address fields will be DNS-resolved.
[ will be enhanced in V7 ]
Both DNS lookups (HOST and SRV) currently only works for registered GWs (not Gatewas without registration).