Uri Dialing Via Dns For Outgoing Calls - Cisco TelePresence Administrator's Manual

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:
1. The VCS checks its search rules
Any alias, or
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Alias pattern match with a pattern that matches the URI address
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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
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lookup. It does this by querying the DNS server configured on the VCS for the location of the domain as
per the URI resolution process via
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
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queried for 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 the Zones page
2. Click New. You are taken to the
3. Enter a Name for the zone and select a Type of DNS.
4. Configure the DNS zone settings as follows:
Field Guidelines
Hop When dialing by URI via DNS, the hop count used is that configured for the DNS zone associated with
count the search rule that matches the URI address (if this is lower than the hop count currently assigned to
the call).
If URI address isn't matched to a DNS zone, the query may be forwarded to a neighbor. In this case, the
hop count used will be that configured for the neighbor zone (if this is lower than the hop count
currently assigned to the call).
H.323 The H.323 and SIP sections allow you to filter calls to systems and endpoints located via this zone,
and SIP based on whether the call is located using SIP or H.323 SRV lookups.
modes
Cisco VCS Administrator Guide (X7.1)
to see if any of them are configured with a Mode of either:
DNS. If the domain part of the URI address is resolved successfully
(VCS configuration > Zones).
Create zone page.
Dial plan and call processing
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