About Enum Dialing; Enum Dialing Process; Enabling Enum Dialing - Cisco TelePresence Administrator's Manual
Video communication server
Hide thumbs
Also See for TelePresence:
- Administrator's manual (507 pages) ,
- Manual (24 pages) ,
- Specifications (7 pages)
Table of Contents
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.
Using ENUM dialing, when an E.164 number is dialed it is converted into a URI using information stored in
DNS. The VCS then attempts to find the endpoint based on the URI that has been returned.
The ENUM dialing facility allows you to retain the flexibility of URI dialing while having the simplicity of being
called using just a number - particularly important if any of your callers are restricted to dialing using 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 for using DNS.
Note: 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.
ENUM dialing process
When a VCS is attempting to locate a destination endpoint using ENUM, the general process is as follows:
1. The user dials the E.164 number from their endpoint.
2. The VCS 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 VCS begins the search again, this time for the converted URI as per the
that this is considered to be a completely new search, and so pre-search transforms and Call Policy will
therefore apply.
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:
configure at least one ENUM zone, and
n
configure at least one DNS Server
n
This is described in the
ENUM dialing for outgoing calls
Incoming calls
Cisco VCS Administrator Guide (X7.2)
Dial plan and call processing
URI dialing
section.
process. Note
Page 205 of 498
Hide quick links:
Table of Contents
