Enum Dialing For Outgoing Calls - Cisco TelePresence Administrator's Manual

Incoming Calls
To enable endpoints in your enterprise to receive incoming calls from other endpoints via ENUM dialing, you
must configure a DNS NAPTR record mapping your endpoints' E.164 numbers to their SIP/H.323 URIs. See
the ENUM dialing for incoming calls
Note: if an ENUM zone and a DNS server have not been configured on the local VCS, calls made using
ENUM dialing could still be placed if the local VCS is neighbored with another VCS that has been
appropriately configured for ENUM dialing. Any ENUM dialed calls will go via the neighbor. This configuration
is useful if you want all ENUM dialing from your enterprise to be configured on one particular system.

ENUM dialing for outgoing calls

Prerequisites
For a local endpoint to be able to dial another endpoint using ENUM via your VCS, the following conditions
must be met:
There must be a NAPTR record available in DNS that maps the called endpoint's E.164 number to its URI.
n
It is the responsibility of the administrator of the enterprise to which the called endpoint belongs to provide
this record, and they will only make it available if they want the endpoints in their enterprise to be
contactable via ENUM dialing.
You must configure an ENUM zone
n
the same as the domain where the NAPTR record for the called endpoint is held.
You must configure your local VCS with the address of at least one
n
NAPTR record (and if necessary any resulting URI).
After the ENUM process has returned one or more URIs, a new search will begin for each of these URIs in
accordance with the URI dialing
configuration is required. However, if one or more of the URIs are not locally registered, you may also need to
configure a DNS zone if they are to be located using a DNS lookup.
Calling process
The process below is followed when an ENUM (E.164) number is dialed from an endpoint registered with
your VCS:
1. The user dials the E.164 number from their endpoint.
2. The VCS initiates a search for the E.164 number as dialed. It follows the usual
3. After applying any pre-search transforms, the VCS checks its
configured with a Mode of either:
Any alias, or
l
Alias pattern match with a pattern that matches the E.164 number
l
4. The target zones associated with any matching search rules are queried in rule priority order.
If a target zone is a neighbor zone, the neighbor is queried for the E.164 number. If the neighbor
l
supports ENUM dialing, it may route the call itself.
Cisco VCS Administrator Guide (X7.1)
section for instructions on how to do this.
on your local VCS. This ENUM zone must have a DNS Suffix that is
process. If the URIs belong to locally registered endpoints, no further
Dial plan and call processing
DNS server that it can query for the
call routing
search rules to see if any of them are
process.
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