Samsung OfficeServ 7200-S General Description Manual page 14

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MEDIA PROXY SERVICE
Media Proxy Service (MPS) is an exciting feature of the OfficeServ 7200-S system.The MPS allows IP devices (such
as SIP stations, IP phones, and SIP trunks) to be switched on the backplane without the need to first convert con-
versations to TDM.This means that IP traffic can be switched without the use of an MGI channel.There are 16 MPS
channels embedded on the MP20S processor card. This means that up to 8 IP-to-IP conversations can be occur-
ring in the switch without the need to purchase an MGI license or any extra hardware. MPS channels can be
expanded by adding OAS cards at a rate of 64 MPS channels per OAS card to a maximum of 3 OAS cards (192MPS
channels.) Every call that uses MPS service will actually use two (2) MPS channels.
The feature is enabled in KMMC 861 or Installation Tool menu 2.1.5 System Options by setting MPS SERVICE to
ON. In addition the NO MPSÔ MGI setting determines if the system should attempt to use an MGI channel when
all MPS channels are busy or return an ALL TRUNKS BUSY error message/tone when all MPS channels are in use.
Both settings default to YES.
When MPS SERVICE is enabled a new field will also be displayed in KMMC 820 and Installation Tool menu 3.3.1
System Link ID called NO MGI.When set to YES for a given SPNET network node communications to that node will
use MPS channels instead of MGI channels when available. In this case both SPNet nodes must have MPS SERVICE
set to ON.
Remember that any IP device talking to any TDM device will still require an MGI channel. The below chart shows
where MPS channels can be used and where devices will peer without using any system resources:
FIGURE 2-1
2.2