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If you are designing a network with a repeater to a roving outstation and want to ensure that if the outstation comes within range of the original base station it does not get two messages (one from the base station and one from the repeater) use Saterm to set up a source mode network. This will utilise the modems overhop function.
Overhop means that the outstation detects that the message is from the base station rather than its usual repeater. It waits to see if it gets a duplicate message and if it does it discards the original, if not it passes the original one through.
Example of what to do if the mobile modem can sometimes see messages directly from the base station and sometimes from a repeater (message routing/over hop)
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