Cisco TelePresence Administrator's Manual page 318

Option
AAAA (IPv6 address)
SRV (SIP and H.323
servers)
NAPTR (Name authority
pointer)
3. Click Lookup.
A separate DNS query is performed for each selected Query type. The domain that is included within the
query sent to DNS depends upon whether the supplied Host is fully qualified or not (a fully qualified host
name contains at least one "dot"):
If the supplied Host is fully qualified:
n
DNS is queried first for Host
l
If the lookup for Host fails, then an additional query for Host.<system_domain> is performed (where
l
<system_domain> is the Domain name as configured on the
If the supplied Host is not fully qualified:
n
DNS is queried first for Host.<system_domain>
l
If the lookup for Host.<system_domain> fails, then an additional query for Host is performed
l
For SRV record type lookups, multiple DNS queries are performed as follows:
An SRV query is made for each of the following _service._protocol combinations:
n
_h323ls._udp.<domain>
l
_h323cs._tcp.<domain>
l
_sips._tcp.<domain>
l
_sip._tcp.<domain>
l
_sip._udp.<domain>
l
_turn._udp.<domain>
l
In each case, as for all other query types, either one or two queries may be performed for a <domain> of
either Host and/or Host.<system_domain>.
Results
A new section will appear showing the results of all of the queries. If successful, it will display the following
information:
Query The type of query that was sent by the VCS.
type
Name The hostname contained in the response to the query.
TTL The length of time (in seconds) that the results of this query will be cached by the VCS.
Class IN (internet) indicates that the response was a DNS record involving an internet hostname, server or
IP address.
Type The record type contained in the response to the query.
Cisco VCS Administrator Guide (X7.2)
Searches for...
a record that maps the hostname to the host's IPv6 address
SRV records (which includes those specific to H.323, SIP and TURN servers,
see below)
a record that rewrites a domain name (into a URI or other domain name for
example)
DNS page)
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