Cisco Cisco TelePresence Video Communication Server Expressway

Appendix 1 – Troubleshooting 

Cisco VCS Deployment Guide: ENUM dialing on Cisco VCS (X6) 

Page 9 of 11 

 

 

TCPDUMP traces taken on Cisco VCS or in the network through which Cisco VCS’s DNS requests 
traverse provide a good mechanism for seeing the DNS (ENUM) request and the relevant response. 

Dig is a command that allows the DNS server to be interrogated to check its configuration. Use this 
command from a Linux system, or download dig for Windows and run that. 

dig  -t NAPTR 1.2.1.7.5.5.enum.search.com. 
 

Should result in a response like this:  

; <<>> DiG 9.4.1 <<>> -t NAPTR 1.2.1.7.5.5.enum.search.com. 

;; global options:  printcmd 

;; Got answer:  

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61653 

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2  

 

;; QUESTION SECTION: 

;1.2.1.7.5.5.enum.search.com. IN     NAPTR 

 

;; ANSWER SECTION: 

1.2.1.7.5.5.enum.search.com. 15 IN    NAPTR   10 100 "u" "E2U+sip" "!^.*$!mary.jones@example.com!" . 

 

;; AUTHORITY SECTION: 

enum.search.com. 15     IN      NS      <Authoritative DNS Server domain>. 

 

;; ADDITIONAL SECTION: 

<Authoritative DNS Server domain>. 

3600 IN A 

<Authoritative DNS Server IPv4 address> 

<Authoritative DNS Server domain>. 

3600 IN AAAA 

<Authoritative DNS Server IPv6 address> 

 

;; Query time: 1 msec 

;; SERVER: <Local DNS Server IP address>#53(<Local DNS Server IP address>) 

;; WHEN: Mon Oct  6 16:17:33 2008 

;; MSG SIZE  rcvd: 182