Cisco Cisco TelePresence Video Communication Server Expressway Maintenance Manual
to that IP address and the search will terminate. Note that if the A and AAAA records that are found at this
domain are for systems other than those that support SIP or H.323, the VCS will still forward the call to this
zone, and the call will therefore fail. For this reason, you are recommended to use the default setting of Off.
domain are for systems other than those that support SIP or H.323, the VCS will still forward the call to this
zone, and the call will therefore fail. For this reason, you are recommended to use the default setting of Off.
—
If the Include address record setting for the DNS zone being queried is set to Off, the VCS will not query
for A and AAAA records and instead will continue with the search, querying the remaining lower priority
zones.
for A and AAAA records and instead will continue with the search, querying the remaining lower priority
zones.
URI Dialing via DNS for Outgoing Calls
When a user places a call using URI dialing, they will typically dial an address in the form
name@example.com
from their
endpoint. Below is the process that is followed when a URI address is dialed from an endpoint registered with your
VCS, or received as a query from a neighbor system:
VCS, or received as a query from a neighbor system:
1.
—
Any alias, or
—
Alias pattern match with a pattern that matches the URI address
2.
The associated target zones are queried, in rule priority order, for the URI.
—
If one of the target zones is a DNS zone, the VCS attempts to locate the endpoint through a DNS lookup. It
does this by querying the DNS server configured on the VCS for the location of the domain as per the
does this by querying the DNS server configured on the VCS for the location of the domain as per the
. If the domain part of the URI address is resolved successfully the request is
forwarded to those addresses.
—
If one of the target zones is a neighbor, traversal client or traversal server zones, those zones are queried for
the URI. If that system supports URI dialing via DNS, it may route the call itself.
the URI. If that system supports URI dialing via DNS, it may route the call itself.
Adding and configuring DNS zones
To enable URI dialing via DNS, you must configure at least one DNS zone. To do this:
1.
Go to Configuration > Zones > Zones.
2.
Click New. You are taken to the Create zone page.
3.
Enter a Name for the zone and select a Type of DNS.
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Cisco TelePresence Video Communication Server Administrator Guide