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.
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.
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
zone will 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.
server that 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:
l
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
ENUM dialing for calls within your network only
l
an internal DNS server that directs the query to an external DNS server
l
an external DNS server
ENUM Dialing on Cisco Expressway Deployment Guide (X8.2)
Page 6 of 12
Configuring the Expressway