AudioCodes Mediant 500 E-SBC User Manual page 478

If the characteristics of an incoming call do not match the first rule in the table, the call
characteristics are compared to those of the second rule, and so on until a matching rule is
located. If no rule is matched, the call is rejected.
You can configure the IP-to-IP routing rule to send the call to any of the following IP
destinations:

According to registered user Contact listed in the device's database (only for User-
type IP Groups).

IP Group - the destination is the address configured for the Proxy Set associated with
the IP Group (allows redundancy/load balancing).

IP address in dotted-decimal notation or FQDN. Routing to a host name can be
resolved using NAPTR/SRV/A-Record.

Request-URI of incoming SIP dialog initiating requests.

According to result of an ENUM query.

Hunt Group - used for call survivability of call centers (see ''Call Survivability for Call
Centers'' on page 458).

IP address according to a specified Dial Plan index listed in the loaded Dial Plan file.

According to result of LDAP query (for more information on LDAP-based routing, see
''Routing Based on LDAP Active Directory Queries'' on page 196).
The IP-to-IP routing rule can also send the IP call to the Tel side (i.e., Gateway call). The
rule redirects the call to the Inbound IP Routing table where the device searches for a
matching IP-to-Tel routing rule. This feature can also be done for alternative routing. If an
IP-to-IP routing rule fails and it is configured with a "Gateway" routing rule as an alternative
route, the device uses the Inbound IP Routing table to send the call to the Tel. The device
identifies (internally) calls re-directed for alternative Gateway routing, by appending a user-
defined string to the prefix destination Request-URI user part (by default, "acgateway-
<prefix destination>", for example, acgateway-200). The device removes this prefix before
sending it to the Tel side. To configure this prefix string, use the GWDirectRoutePrefix ini
file parameter.
User's Manual 478
Mediant 500 E-SBC
Document #: LTRT-10427