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As mentioned in the section called “Private calls”, DMR aims at being repeater transparent. That is, it does not matter which repeater is used for the operation. This is also true for talk groups. In this section, I'll continue with the example of an OM at his holiday location, who wants to participate in his afternoon net. For example, the afternoon net is happening on the talk group 2621 (Berlin/Brandenbug, BB). This talk group is usually statically subscribed on all repeaters in the states Berlin and Brandenbug. That means that the local afternoon net can be performed in this talk group without any additional action in this area. (see Example 1.12, “Talk group operation between countries” top image).

Example 1.12. Talk group operation between countries

For the OM at his holiday location, this it not true. An Italian repeater will certainly not subscribe the BB talk group statically. Therefore, the OM at the holiday location will not hear his afternoon net. He knows, however, when this net starts. So he can perform a group call to the that TG shortly before the net starts (see Example 1.12, “Talk group operation between countries” second image). This will subscribe the BB talk group temporarily at the holiday repeater (I0ABC). Now, the OM can hear and participate in the afternoon net. The subscription will be renewed whenever he starts a group call to that TG.

Once the OM subscribed the TG to the holiday repeater, he can participate normally at his afternoon net. All other participants will not even notice that he is not in the area and is participating from an italien repeater.