Cisco Cisco Expressway Maintenance Manual
4.
If the alias is not found, the search rules with the next highest priority are applied (go back to step 1) until:
—
the alias is found, or
—
all target zones and policy services associated with search rules that meet the specified criteria have been
queried, or
queried, or
—
a search rule with a successful match has an On successful match setting of Stop searching
Note the difference between a successful match (where the alias matches the search rule criteria) and an alias being
found (where a query sent to a target zone is successful). The Stop searching option provides better control over the
network's signaling infrastructure. For example, if searches for a particular domain should always be routed to a
specific zone this option lets you make the search process more efficient and stop the Expressway from searching
any other zones unnecessarily.
found (where a query sent to a target zone is successful). The Stop searching option provides better control over the
network's signaling infrastructure. For example, if searches for a particular domain should always be routed to a
specific zone this option lets you make the search process more efficient and stop the Expressway from searching
any other zones unnecessarily.
Configuring Search Rules
The Search rules page (Configuration > Dial plan > Search rules) is used to configure how the Expressway routes
incoming search requests to the appropriate target zones (including the Local Zone) or policy services.
incoming search requests to the appropriate target zones (including the Local Zone) or policy services.
The page lists all the currently configured search rules and lets you create, edit, delete, enable and disable rules. You
can click on a column heading to sort the list, for example by Target or Priority. If you hover your mouse pointer over a
search rule, the rule description (if one has been defined) appears as a tooltip.
can click on a column heading to sort the list, for example by Target or Priority. If you hover your mouse pointer over a
search rule, the rule description (if one has been defined) appears as a tooltip.
You can also copy and then edit any existing search rule by clicking Clone in the Actions column.
Up to 2000 search rules can be configured. Priority 1 search rules are applied first, followed by all priority 2 search
rules, and so on.
rules, and so on.
The configurable options are:
Field
Description
Usage tips
Rule name
A descriptive name for the search rule.
Description
An optional free-form description of the search
rule.
rule.
The description appears as a tooltip if you
hover your mouse pointer over a rule in the list.
hover your mouse pointer over a rule in the list.
Priority
The order in the search process that this rule is
applied, when compared to the priority of the
other search rules. All Priority 1 search rules are
applied first, followed by all Priority 2 search
rules, and so on. More than one rule can be
assigned the same priority, in which case any
matching target zones are queried
simultaneously. The default is 100.
applied, when compared to the priority of the
other search rules. All Priority 1 search rules are
applied first, followed by all Priority 2 search
rules, and so on. More than one rule can be
assigned the same priority, in which case any
matching target zones are queried
simultaneously. The default is 100.
The default configuration means that the Local
Zone is searched first for all aliases. If the alias
is not found locally, all neighbor, traversal
client and traversal server zones are searched,
and if they cannot locate the alias the request
is sent to any DNS and ENUM zones.
Zone is searched first for all aliases. If the alias
is not found locally, all neighbor, traversal
client and traversal server zones are searched,
and if they cannot locate the alias the request
is sent to any DNS and ENUM zones.
Protocol
The source protocol for which the rule applies.
The options are Any, H.323 or SIP.
The options are Any, H.323 or SIP.
Source
The sources of the requests for which this rule
applies.
applies.
Any: neighbor or traversal zones, and any non-
registered devices.
registered devices.
All zones: neighbor or traversal zones.
Named: a specific source zone for which the rule
applies.
applies.
Named sources creates the ability for search
rules to be applied as dial plan policy for
specific zones.
rules to be applied as dial plan policy for
specific zones.
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Cisco Expressway Administrator Guide
Dial Plan and Call Processing