AudioCodes Mediant 4000 SBC User Manual page 387

User's Manual
specified Dial Plan to obtain the corresponding Dial Plan tag. Call Setup rules can also
change (modify) the name of the obtained tag. The device can then route the call
using an IP-to-IP Routing rule (in the IP-to-IP Routing table) that has a matching tag
(source or destination). You can also associate a Call Setup rule with an IP Group (in
the IP Group table). Once the device classifies the incoming call to a source IP Group,
it processes the associated Call Setup rule and then uses the resultant tag to locate a
matching IP-to-IP Routing rule. You can also use Call Setup rules for complex routing
schemes by using multiple Dial Plan tags. This is typically required when the source
and/or destination of the call needs to be categorized with more than one
characteristics. For example, tags can be used to categorize calls by department
(source user) within a company, where only certain departments are allowed to place
international calls.

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 format 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.

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 to one of the following, using the 'Call Setup Rules Set ID'
field:

SBC IP-to-IP routing ( see Configuring SBC IP-to-IP Routing Rules on page 499)

IP Groups (see Configuring IP Groups on page 349)

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
Version 7.2 387
18. SIP Definitions
Mediant 4000 SBC