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 tayab.edu.bd

_sip._tls                                 IN      SRV 100 1 443    sipdir.online.lync.com.

_sipfederationtls._tcp          IN      SRV 100 1 5061  sipfed.online.lync.com.

If
 priority       = 100
 weight         = 1
 port           = 443
target svr hostname   = sipdir.online.lync.com
protocol = tls

 and

  priority       = 100
  weight         = 1
  port           = 5061
target svr hostname   = sipfed.online.lync.com
  protocol = tcp




Cecking SRV records:
===============
Check from DNS server:
------------------------------
 dig  _sip._tls.tayab.edu.bd   SRV
 dig  _sipfederationtls._tcp.tayab.edu.bd SRV


Check from Web: Go to
-----------------------------
http://mxtoolbox.com/
srv:_sip._tls.tayab.edu.bd


Check from PC
--------------------
nslookup -querytype=srv _sip._tls.tayab.edu.bd
nslookup -querytype=srv _sipfederationtls._tcp.tayab.edu.bd