Monday, January 26, 2015

SRV (service) record for DNS for Microsoft Windows clients

A Service record (SRV record) is a specification of data in the Domain Name System defining the location, i.e. the hostname and port number, of servers for specified services. Some Internet protocols such as
Session Initiation Protocol (SIP) and
Extensible Messaging and Presence Protocol (XMPP)
often require SRV support by network elements.

Edit DNS servers ZONE file for

_sip._tls                                 IN      SRV 100 1 443

_sipfederationtls._tcp          IN      SRV 100 1 5061

 priority       = 100
 weight         = 1
 port           = 443
target svr hostname   =
protocol = tls


  priority       = 100
  weight         = 1
  port           = 5061
target svr hostname   =
  protocol = tcp

Cecking SRV records:
Check from DNS server:
 dig   SRV
 dig SRV

Check from Web: Go to

Check from PC
nslookup -querytype=srv
nslookup -querytype=srv

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