Cisco Cisco Expressway
In this example, the search rule filters requests to the ENUM zone so that it is only queried for certain digit strings. A
transform is also applied to remove any domain that may have been added by a SIP device or by a transform in the
Expressway to make E164 numbers into URIs.
transform is also applied to remove any domain that may have been added by a SIP device or by a transform in the
Expressway to make E164 numbers into URIs.
The above configuration means that when a call is made to 557123 or 557123@exp.domain then this ENUM zone will
perform a lookup of NAPTR records at: 3.2.1.7.5.5.enum.search.com
perform a lookup of NAPTR records at: 3.2.1.7.5.5.enum.search.com
Configuring the Expressway with a DNS Server
For the Expressway to perform a DNS query for an ENUM zone, it must be configured with at least one DNS server that
can resolve the query for the DNS location where the NAPTR records for that particular ENUM lookup are held.
can resolve the query for the DNS location where the NAPTR records for that particular ENUM lookup are held.
To configure the Expressway with details of a DNS server to use:
1.
Go to System > DNS.
2.
In one of the available Address fields, enter the IP address of the DNS server that will be used to resolve the
NAPTR query. This could be:
NAPTR query. This could be:
—
an internal DNS server that holds the NAPTR records – for example, use this if you are implementing ENUM
dialing for calls within your network only
dialing for calls within your network only
—
an internal DNS server that directs the query to an external DNS server
—
an external DNS server
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Cisco Expressway ENUM Dialing Deployment Guide