Cisco Cisco Expressway Maintenance Manual
Supported address formats
The destination address that is entered using the caller’s endpoint can take a number of different formats, and
this affects the specific process that the Expressway follows when attempting to locate the destination
endpoint. The address formats supported by the Expressway are:
this affects the specific process that the Expressway follows when attempting to locate the destination
endpoint. The address formats supported by the Expressway are:
n
IP address, for example 10.44.10.1 or 3ffe:80ee:3706::10:35
n
H.323 ID, for example john.smith or john.smith@example.com (note that an H.323 ID can be in the
form of a URI)
form of a URI)
n
E.164 alias, for example 441189876432 or 6432
n
URI, for example john.smith@example.com
n
ENUM, for example 441189876432 or 6432
Each of these address formats may require some configuration of the Expressway in order for them to be
supported. These configuration requirements are described below.
supported. These configuration requirements are described below.
Dialing by IP address
Dialing by IP address is necessary when the destination endpoint is not registered with any system. See the
section for more information.
Dialing by H.323 ID or E.164 alias
No special configuration is required to place a call using an H.323 ID or E.164 alias.
, applying any transforms and then searching the
external zones for the alias, according to the search rules.
Note that SIP endpoints always register using an AOR in the form of a URI. You are recommended to ensure
that H.323 endpoints also register with an H.323 ID in the form of a URI to facilitate interworking.
that H.323 endpoints also register with an H.323 ID in the form of a URI to facilitate interworking.
Dialing by H.323 or SIP URI
When a user places a call using URI dialing, they will typically dial name@example.com.
If the destination endpoint is registered to a neighbor system, no special configuration is required for the call
to be placed. The Expressway follows the usual
to be placed. The Expressway follows the usual
, applying any transforms and then searching
the external zones for the alias, according to the search rules.
URI dialing may make use of DNS to locate the destination endpoint. To support URI dialing via DNS, you
must configure the Expressway with at least one DNS server and at least one DNS zone.
must configure the Expressway with at least one DNS server and at least one DNS zone.
Full instructions on how to configure the Expressway to support URI dialing via DNS (both outbound and
inbound) are given in the URI dialing section.
inbound) are given in the URI dialing section.
Dialing by ENUM
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.
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.
Cisco Expressway Administrator Guide (X8.2)
Page 158 of 378
Dial plan and call processing
Supported address formats