Cisco Cisco Expressway Manual De Manutenção
Enabling ENUM Dialing
ENUM dialing is enabled separately for incoming and outgoing calls.
Outgoing calls
To allow outgoing calls to endpoints using ENUM, you must:
■
configure at least one ENUM zone, and
■
configure at least one DNS Server
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
configure a DNS NAPTR record mapping your endpoints’ E.164 numbers to their SIP/H.323 URIs. See the
section for instructions on how to do this.
Note:
if an ENUM zone and a DNS server have not been configured on the local Expressway, calls made using ENUM
dialing could still be placed if the local Expressway is neighbored with another Expressway 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.
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
For a local endpoint to be able to dial another endpoint using ENUM via your Expressway, the following conditions
must be met:
must be met:
■
There must be a NAPTR record available in DNS that maps the called endpoint’s E.164 number to its URI. 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.
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.
■
the same as the domain where the NAPTR record for the called endpoint is held.
■
that it can query for the
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
with the
. If the URIs belong to locally registered endpoints, no further 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.
to be located using a DNS lookup.
Calling process
The Expressway follows this process when searching for an ENUM (E.164) number:
1.
The Expressway initiates a search for the received E.164 number as it was dialed. It follows the usual
2.
to see if any of them are
configured with a Mode of either:
—
Any alias, or
—
Alias pattern match with a pattern that matches the E.164 number
197
Cisco Expressway Administrator Guide
Dial Plan and Call Processing