3.3.3.3.2. Sample Scenario with two Mediatrix 44xx Gateways 
In this sample scenario, one Mediatrix gateway is used for subscribers,
while the other is used for trunking to the public network.
Figure 66. OpenScape 4000 SoftGate scenario with two Mediatrix gateways
This type of scenario is an alternative to the configuration of subscribers
and trunking within a single gateway. This clock synchronization method
is also needed if more than four ISDN S0 ports are to be configured (up
to four S0 ports are available on a single Mediatrix gateway).