Configuring Zones And Search Rules For Enum Dialing - Cisco TelePresence Administrator's Manual

Dial plan and call processing
zones in priority order).From this point, as it is now searching for a SIP/H.323 URI, the process for
dialing is followed.
In this example, we want to call Fred at Example Corp. Fred's endpoint is actually registered with the URI
fred@example.com, but to make it easier to contact him his system administrator has configured a DNS
NAPTR record mapping this alias to his E.164 number: +44123456789.
We know that the NAPTR record for example.com uses the DNS domain of e164.arpa.
1. We create an ENUM zone on our local VCS with a DNS suffix of e164.arpa.
2. We configure a search rule with a Pattern match mode of Any alias, and set the Target to the ENUM
zone. This means that ENUM will always be queried regardless of the format of the alias being searched
for.
3. We dial 44123456789 from our endpoint.
4. The VCS initiates a search for a registration of 44123456789 and the search rule of Any alias means the
ENUM zone is queried. (Note that other higher priority searches could potentially match the number first.)
5. Because the zone being queried is an ENUM zone, the VCS is automatically triggered to transform the
number into an ENUM domain as follows:
a. The digits are reversed and separated by a dot: 9.8.7.6.5.4.3.2.1.4.4.
b. The DNS suffix configured for this ENUM zone, e164.arpa, is appended. This results in a
transformed domain of 9.8.7.6.5.4.3.2.1.4.4.e164.arpa.
6. DNS is then queried for that ENUM domain.
7. The DNS server finds the domain and returns the information in the associated NAPTR record. This tells
the VCS that the E.164 number we have dialed is mapped to the SIP URI of fred@example.com.
8. The VCS then starts another search, this time for fred@example.com. From this point the process for
URI dialing is followed, and results in the call being forwarded to Fred's endpoint.

Configuring zones and search rules for ENUM dialing

To support ENUM dialing, you must configure an ENUM zone and related search rules for each ENUM
service used by remote endpoints.
Adding and configuring ENUM zones
To set up an ENUM zone:
1. Go to Configuration > Zones >
2. Click New. You are taken to the
3. Enter a Name for the zone and select a Type of ENUM.
4. Configure the ENUM zone settings as follows:
Field Guidelines
Hop count The hop count
other zone types. The currently applicable hop count is maintained when the VCS initiates a
new search process for the alias returned by the DNS lookup.
DNS suffix The suffix to append to a transformed E.164 number to create an ENUM host name. It
represents the DNS zone (in the domain name space) to be queried for a NAPTR record.
Cisco VCS Administrator Guide (X8.1.1)
Zones.
Create zone page.
specified for an ENUM zone is applied in the same manner as hop counts for
About ENUM dialing
URI
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