IANA-registered service name, always starts with an ‘_’ to avoid collisions with ordinary DNS names.
_sip for SIP
Protocol
Transport protocol.
Priority
Order, from lowest to highest, to try reaching hosts.
Weight
Emphasis to put on this record when other records have the same priority, used for load balancing. For example, in the records below, the weights total to 4:
• 1/4 of the traffic will go to huey.
• 1/4 will go to dewey.
• 2/4 will go to louie.
_sip._udp.naptr-udp.tekelec.com. 600 IN SRV 10 1 5060 huey.tekelec.com.
_sip._udp.naptr-udp.tekelec.com. 600 IN SRV 10 1 5060 dewey.tekelec.com.
_sip._udp.naptr-udp.tekelec.com. 600 IN SRV 10 2 5060 louie.tekelec.com.
Port
The port to use if this record is selected.
Target
A name to lookup using A or AAAA if this record is selected.
