SRV record is called Service record and it is used to defining location in a DNS especially the hostname and port number, of servers for specified services. It is defined in RFC 2782, and its type code is 33. Internet protocols like SIP, XMPP will require SRV support by network elements.
To add the SRV record looking like:
_service._protocol.name TTL class SRV priority weight port target
Examples:-
_sipfederationtls._tcp 3600 IN SRV 1 100 5061 sipfed.example.com.
_sip._tcp 3600 IN SRV 1 100 443 sipdir.example.com.
Service
Defines the symbolic service name
_http – web service
_ftp – file transfer service
_ldap – LDAP service
_imap – IMAP mail service
_PKIXREP – PKIX Repository (X.509 certificates)
Protocol
The transport protocol of the desired service
_tcp – TCP protocol
_udp – UDP protocol
name
the domain name for which this record is valid.
ttl
Optional. Standard TTL parameter
class
Optional. Standard CLASS parameter
priority
The relative Priority of this service (range 0 – 65535). Lowest is highest priority, usage is the same as the MX pref field.
weight
A relative weight for records with the same priority.Used when more than one service has the same priority. A 16 bit unsigned integer in the range 0 – 65535. The value 0 indicates no weighting should be applied.
port
the TCP or UDP port on which the service is to be found.
target
the canonical hostname of the machine providing the service.
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