Enum Dialing; Enum Dialing Overview; About Enum Dialing; Enum Process - TANDBERG VCS Administration Manual

ENUM Dialing

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About ENUM Dialing

ENUM dialing allows an endpoint to be contacted by a caller
dialing an E.164 number - a telephone number - even if that
endpoint has registered using a different format of alias.
The E.164 number is converted into a URI by the DNS system,
and the rules for URI dialing are then followed to place the call.
The ENUM dialing facility allows you to retain the flexibility of
URI dialing whilst having the simplicity of being called using
just a number - particularly important if any of your callers are
restricted to dialing via a numeric keypad.
The VCS supports outward ENUM dialing by allowing you
to configure ENUM zones on the VCS. When an ENUM
zone is queried, this triggers the VCS to transform the
E.164 number that was dialed into an ENUM domain which is
then queried via DNS.
Note however that ENUM dialing relies on the presence of
relevant DNS NAPTR records for the ENUM domain being
queried. These are the responsibility of the administrator of
that domain.
Getting System
Introduction
Started Overview
D 14049.01
07.2007

ENUM Dialing Overview

ENUM Process

When a system is attempting dial a destination endpoint using
ENUM, the general process is as follows:
The user dials the E.164 number from their endpoint.
.
The system converts the E.164 number into an ENUM
.
domain as follows:
a. the digits are reversed and separated by a dot
b. the name of the domain that is hosting the NAPTR
records for that E.164 number is added as a suffix.
3. DNS is then queried for the resulting ENUM domain.
4. If a NAPTR record exists for that ENUM domain, this will
advise how the number should be converted into one (or
possibly more) H.323/SIP URIs.
5. The system then sends out another DNS query for that URI.
From this point the process for
System H.323 & SIP Registration
Configuration Configuration Control

Enabling ENUM Dialing

ENUM dialing is enabled separately for incoming and outgoing
calls.

Outgoing Calls

To allow locally registered endpoints to dial out to other
endpoints using ENUM, you must
•
•
This is described in the section
outgoing

Incoming Calls

To enable endpoints in your enterprise to receive incoming calls
URI Dialing is followed.
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 section
dialing for incoming calls
neighbored with another VCS that has been appropriately
configured. 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.
Zones and Call Call
Neighbors Processing Processing
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configure at least one ENUM zone, and
configure at least one DNS Server.
Configuring ENUM Dialing for
calls.
Configuring ENUM
for instructions on how to do this.
If an ENUM zone and/or 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
Firewall Bandwidth
Maintenance
Traversal Control
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Appendices