AudioCodes Mediant 800 User Manual page 544

CHAPTER 20 SIP Definitions
■ ENUM queries: For SBC calls, you can use Call Setup rules to query an ENUM server and to
handle responses from the ENUM server. ENUM translates ordinary telephone numbers
(E.164 telephone numbers) into Internet addresses (SIP URIs), using the ENUM's DNS
NAPTR records. For example, if the device receives an INVITE message whose destination
number is in E.164 format, you can configure a Call Setup rule to query the ENUM server for
the corresponding URI address, which is then used in the INVITE's Request-URI.
■ HTTP requests (queries): You can use Call Setup rules to query or notify an HTTP/S server,
which is configured in the Remote Web Services table
page 257). If a response is expected from the server, the query is sent as an HTTP GET or
HTTP POST request (configurable). If no response is required from the server (i.e., to notify the
server of a specific condition), then an HTTP POST for notifications is sent (configurable).
■ Manipulation (similar to the Message Manipulations table) of call parameters (such as source
number, destination number, and redirect number) and SBC SIP messages.
■ Conditions for routing, for example, if the source number equals a specific value, then use the
call routing rule.
You configure multiple Call Setup rules and group them using a Set ID. This lets you apply multiple
Call Setup rules on the same call setup dialog. To use your Call Setup rule(s), you need to assign
the Set ID to one of the following, using the 'Call Setup Rules Set ID' field:
■ (SBC application) SBC IP-to-IP routing rules (see
■ (SBC application) SIP Interface rules (see
■ (Gateway application) Tel-to-IP routing rules (see
■ (Gateway application) IP-to-Tel routing rules (see
■ IP Groups (see
If assigned to an IP Group, the device processes the Call Setup rule for the classified source IP
Group immediately before the routing process. If assigned to a routing rule only, the device first
locates a matching routing rule for the incoming call, processes the assigned Call Setup Rules Set
ID, and then routes the call according to the destination configured for the routing rule. The device
uses the routing rule to route the call depending on the result of the Call Setup Rules Set ID:
■ Rule's condition is met: The device performs the rule's action and then runs the next rule in
the Set ID until the last rule or until a rule with an Exit Action Type. If the Exit rule is configured
with a "True" Action Value, the device uses the current routing rule. If the Exit rule is
configured with a "False" Action Value, the device moves to the next routing rule. If an Exit
Action Type is not configured and the device has run all the rules in the Set ID, the default
Action Value of the Set ID is "True" (i.e., use the current routing rule).
■ Rule's condition is not met: The device runs the next rule in the Set ID. When the device
reaches the end of the Set ID and no Exit was performed, the Set ID ends with a "True" result.
You can also configure a Call Setup rule that determines whether the device must discontinue with
the Call Setup Rules Set ID and route the call accordingly. This is done using the Exit optional
value of the 'Action Type' parameter. When used, the 'Action Value' parameter can be configured to
one of the following strings:
■ "true": Indicates that if the condition is met, the device routes the call according to the selected
routing rule. Note that if the condition is not met, the device also uses the selected routing rule,
unless the next Call Setup rule in the Set ID has an Exit option configured to "false" for an
empty condition.
■ "false": Indicates that if the condition is met, the device attempts to route the call to the next
matching routing rule (if configured). If the condition is not met, the device routes the call
according to the selected routing rule.
As the default result of a Call Setup rule is always "true", please adhere to the following guidelines
when configuring the 'Action Type' field to Exit: If, for example, you want to exit the Call Setup Rule
Set ID with "true" when LDAP query result is found and "false" when LDAP query result is not
found:
■ Incorrect -this rule will always exit with result = True:
Configuring IP Groups)
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Mediant 800 Gateway & E-SBC | User's Manual
(Configuring Remote Web Services
Configuring SBC IP-to-IP Routing
Configuring SIP Interfaces
Configuring Tel-to-IP Routing
Configuring IP-to-Tel Routing
on
Rules)
on page 348)
Rules)
Rules)