Allied Telesis AT-iMG634 - R2 User's Guide download pdf (Page 565)

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MGCP Functional Description VoIP MGCP

6-1

iMG/RG Software Reference Manual (Voice Service)

6. Voice Service

6.1 VoIP MGCP

The MGCP (Media Gateway Control Protocol) is a protocol that assumes a call control architecture where the

call control ‘intelligence’ is outside the gateways and is handled by external call control elements, the call agent.

MGCP assumes that the gateways have limited storage and functionality.

So, there are two MGCP entities: Call Agent (Media Gateway Controller, MGC) which handles the call control

‘intelligence’, that means the call signaling and the call processing functions and the Media Gateway (MG) that

provides conversion between the audio signals carried on telephone circuits and data packets carried over

Internet or packets networks and expects to execute command sent by the Call Agent.

iMG/RG/iBG devices implement the Media gateway side.

MGCP is a master/slave protocol, while the call agent is mandatory and manages the calls and conferences and

supports the services provided, the endpoint is unaware of the calls and conferences and does not maintain call

states, it is simply expected to execute commands sent by the call agent.

6.1.1 MGCP Functional Description

6.1.1.1 Endpoints

iMG/RG/iBG devices support the configuration of each FXS (Foreign Exchange Station) voice port as a separate

MGCP analogue endpoint allowing a different level of services (number of phone lines) to be delivered.

Each voice port is identified univocal through an endpoint identifier that, by default, takes the following syntax:

Syntax aaln/<slot>@[$IP]

where:

AALN -Analog Access Line eNdpoint. This name indicates that the endpoint is analog type (only FXS voice

interfaces are supported).

<slot> - indicates the index of the voice port. Physical voice ports start with index 0, the second physical voice

port uses index 1 and so on.

$IP - it’s the ip address of the ip interface where the MGCP protocol is enabled. It is typically used in a multi

host configuration where more than one IP interface is configured in the system or when the ip interface is

dynamic and therefore the value is dynamically assigned by the network.

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