CHAPTER1 Introduction
Mediant 1000 Gateway & E-SBC | User's Manual
The main configuration entities and their involvement in the call processing is summarized in
following figure. The figure is used only as an example to provide basic understanding of the
configuration terminology. Depending on configuration and network topology, the call process may
include additional stages or a different order of stages.
1. The device determines the SIP Interface on which the incoming SIP dialog is received and
thus, determines its associated SRD.
2. The device classifies the dialog to an IP Group (origin of dialog), using a specific Classification
rule that is associated with the dialog's SRD and that matches the incoming characteristics of
the incoming dialog defined for the rule.
3. IP Profile and inbound manipulation can be applied to incoming dialog.
4. The device routes the dialog to an IP Group (destination), using the IP-to-IP Routing table. The
destination SRD (and thus, SIP Interface and Media Realm) is the one assigned to the IP
Group. Outbound manipulation can be applied to the outgoing dialog.
Gateway Application
The objective of your configuration is to enable the device to forward calls between the IP-based
endpoints and PSTN-based endpoints. The PSTN-based endpoints can be analog endpoints such
as FXS (plain old telephone service or POTS) or FXO (e.g., PBX) or digital endpoints such as ISDN
trunks. The IP-based endpoints (SIP entities) can be servers such as SIP proxy servers and IP
PBXs, or end users such as LAN IP phones. In the SIP world, the endpoints are referred to as SIP
user agents (UA). The UA that initiates the call is referred to as the user agent client (UAC); the UA
that accepts the call is referred to as the user-agent server (UAS).
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