MGCP Gateways
Gateways are
clustering points for endpoints. These gateways handle the translation of audio
between the SCN and the packet network.
Although gateways are implemented in real systems, from a
modeling point of view, gateways are logical components. In this context,
gateways represent a clustering of a single type and profile of endpoints.
Note
A gateway interacts with one call agent only. Therefore, a
gateway associates with one call agent at a time.
RFC 2705 identifies the following seven types of gateways:
-
Trunk gateway Signaling System 7
(SS7) ISDN User Part (ISUP) Supports digital circuit endpoints subject to
ISDN signaling
-
Trunk gateway multifrequency
(MF) Typically supports digital or analog circuit endpoints that are
connected to a service provider of an enterprise switch that is subject to MF
signaling
-
Network access server (NAS)
Supports an interconnect to endpoints over which data (for example, modem)
applications are provided
-
Combined NAS/VoIP gateway
Supports an interconnect to endpoints over which a combination of voice and data
access is provided
-
Access gateway Supports analog
and digital endpoints connected to a PBX
-
Residential gateway Supports
endpoints connected to traditional analog interfaces
-
Announcement servers Supports
endpoints that represent access to announcement services
Multiple gateway types, and multiple instances of the same
type, can be incorporated into a single physical gateway implementation.
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