AudioCodes Mediant 4000 SBC User Manual page 531

CHAPTER 22 SBC Overview
You can specify the SIP header from where you want the device to obtain the source
URL in the incoming dialog request. This is configured in the IP Groups table using the
'Source URI Input' parameter (see
The next stages of the SIP dialog-initiating process is as follows:
1. Determining the SIP Interface: The device checks the SIP Interface on which the SIP dialog
is received. The SIP Interface defines the local SIP "listening" port and IP network interface.
For more information, see
2. Applying Pre-parsing SIP Message Manipulation: If configured, the device can apply SIP
message manipulation to the incoming SIP message before it is parsed by the device. This
type of manipulation is called Pre-Parsing Manipulation, which is configured in the Pre-Parsing
Manipulation Sets table (see
assigned to the SIP Interface.
3. Applying Pre-classification SIP Message Manipulation: If configured, the device can
apply SIP message manipulation to the incoming SIP message before it is classified to a
source IP Group. This manipulation is configured in the SIP Message Manipulations table (see
Configuring SIP Message Manipulation)
4. Classifying to a Source IP Group using Tags: If configured, the device can classify the
incoming SIP message to a source IP Group, based on a source tag that is determined by
running a Call Setup Rule. The Call Setup Rule is configured in the Call Setup Rules table (see
Configuring Call Setup Rules
information on tag-based classification, see
page 544.
5. Classifying to a Source IP Group: Classification identifies the incoming SIP dialog request
as belonging to a specific IP Group (i.e., from where the SIP dialog request originated). The
classification process is based on the SRD to which the dialog belongs (the SRD is
determined according to the SIP Interface). For more information, see
Classification
6. Applying Inbound Manipulation: Depending on configuration, the device can apply an
Inbound Manipulation rule to the incoming dialog. This manipulates the user part of the SIP URI
for source (e.g., in the SIP From header) and destination (e.g., in the Request-URI line). The
manipulation rule is associated with the incoming dialog, by configuring the rule with incoming
matching characteristics such as source IP Group and destination host name. The
manipulation rules are also assigned a Routing Policy, which in turn, is assigned to IP-to-IP
routing rules. As most deployments require only one Routing Policy, the default Routing Policy
is automatically assigned to manipulation and routing rules. For more information, see
Configuring IP-to-IP Inbound
7. Applying a Dial Plan to Determine Tag: If configured, the device can run a Dial Plan rule
based on the source (or destination) number of the incoming SIP message to determine its' tag.
The tag can later be used in the routing and manipulation stages. Dial Plan rules are configured
in the Dial Plan table (see
8. Applying Call Setup Rules for Various Functions: If configured, the device can run Call
Setup Rules to apply various functions to the call, for example, querying an LDAP server. The
Call Setup Rule is configured in the Call Setup Rules table (see
on page 452) and is assigned to the IP Group.
9. SBC IP-to-IP Routing: The device searches the IP-to-IP Routing table for a routing rule that
matches the characteristics of the incoming call. If found, the device routes the call to the
configured destination which can be, for example, an IP Group, the Request-URI if the user is
registered with the device, and a specified IP address. For more information, see
SBC IP-to-IP Routing
Configuring SIP
Configuring Pre-Parsing Manipulation Rules
on page 452) and is assigned to the SIP Interface. For more
Rules.
Manipulations.
Configuring Dial Plans
Rules.
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Mediant 4000 SBC | User's Manual
Configuring IP Groups).
Interfaces.
and is assigned to the SIP Interface.
Configuring Classification Based on Tags
on page 462) and assigned to the IP Group.
on page 488) and is
on
Configuring
Configuring Call Setup Rules
Configuring