$TTL 200

@   IN  SOA oa25399-ux.mydns.org.       root.mydns.org.(
    2006052701 ; serial
    220 ; refresh
    360; retry
    220; expire
    220; default_ttl

)


mydns.org.      IN NS  oa25399-ux.mydns.org.

mydns.org.     IN A   192.168.1.1


_sip._udp.mydns.org. 86400 IN SRV 0 5 5060 oa25399-ux.mydns.org.


;@   IN NS oa25399-ux.
    ; Nom du serveur Dns
;   IN A 192.168.1.1
;   oa25399-ux IN A 192.168.1.1

nslookup
> set type=SRV
> _sip._udp
Server:     10.1.1.6
Address:    10.1.1.6#53

** server can't find _sip._udp: NXDOMAIN
> _sip._udp.mydns.org.
Server:     10.1.1.6
Address:    10.1.1.6#53

Non-authoritative answer:
*** Can't find _sip._udp.mydns.org.: No answer

;; QUESTION SECTION:
;_sip._udp.mydns.org.       IN  SRV

;; AUTHORITY SECTION:
mydns.org.      604 IN  SOA ns1.mydomain.com. hostmaster.mydns.org. 2012043004 16384 2048 1048576 86400