Cisco Cisco Expressway

4.3.7.8.enum4.example.com. 60 IN NAPTR 10 100 "u" "E2U+sip" "!^.*$!bob@example.com!" .

4.3.7.8.enum4.example.com. 60 IN NAPTR 10 100 "u" "E2U+h323" "!^.*$!bob@example.com!" .

;; AUTHORITY SECTION:

enum4.example.com. 60 IN NS int-server1.example.com.

;; ADDITIONAL SECTION:

int-server1.example.com. 3600 IN A 10.44.9.144

int-server1.example.com. 3600 IN AAAA 3ffe:80ee:3706::9:144

;; Query time: 0 msec

Looking up a domain NAPTR record

Example: NAPTR record allowing endpoints to detect that they are in the public (external) network. The flag “s” is
extended to “se” to indicate that it is “external”.

~ # dig -t NAPTR example.com

; <<>> DiG 9.4.1 <<>> -t NAPTR example.com
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1895
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 6, ADDITIONAL: 4

;; QUESTION SECTION:
;example.com. IN NAPTR

;; ANSWER SECTION:
example.com.     2      IN   NAPTR   50 50 "se" "SIPS+D2T" "" _sips._tcp.example.com.
example.com.     2      IN   NAPTR   90 50 "se" "SIP+D2T" "" _sip._tcp.example.com.
example.com.     2      IN   NAPTR   100 50 "se" "SIP+D2U" "" _sip._udp.example.com.

;; AUTHORITY SECTION:
example.com.              320069 IN      NS      nserver2.example.com.
example.com.              320069 IN      NS      nserver.euro.example.com.
example.com.              320069 IN      NS      nserver.example.com.
example.com.              320069 IN      NS      nserver3.example.com.
example.com.              320069 IN      NS      nserver4.example.com.
example.com.              320069 IN      NS      nserver.asia.example.com.

;; ADDITIONAL SECTION:
nserver.example.com.      56190   IN     A       17.111.10.50
nserver2.example.com.     57247   IN     A       17.111.10.59
nserver3.example.com.     57581   IN     A       17.22.14.50
nserver4.example.com.     57452   IN     A       17.22.14.59

;; Query time: 11 msec

Cisco Expressway Cluster Creation and Maintenance Deployment Guide

Appendix 4: NAPTR Records