Ich denke, das muss die GTSI sein.
"A TETRA group is regarded as a single subscriber and thus is allocated a unique TETRA identity - a GTSI. GTSIs have the same format as ITSIs and comprise a (T)MCC + (T)MNC + GSSI"
hier aus meinem Log:
Code:20 Jun 19:33:53 - [info] [debug:status4 tx] AT+CTSP=1,1,11 20 Jun 19:33:53 - [info] [debug:status4 rx] OK 20 Jun 19:33:54 - [info] [debug:status4 tx] AT+CTGS=1,262100102xxxxx8 20 Jun 19:33:54 - [info] [debug:status4 rx] OK