diff --git a/ttcn3-bts-test/osmo-bsc.cfg b/ttcn3-bts-test/osmo-bsc.cfg
index e4e2493d..b66d7760 100644
--- a/ttcn3-bts-test/osmo-bsc.cfg
+++ b/ttcn3-bts-test/osmo-bsc.cfg
@@ -154,10 +154,10 @@ network
     phys_chan_config TCH/F
     hopping enabled 0
    timeslot 3
-    phys_chan_config TCH/F
+    phys_chan_config TCH/F_PDCH
     hopping enabled 0
    timeslot 4
-    phys_chan_config TCH/F
+    phys_chan_config TCH/F_TCH/H_PDCH
     hopping enabled 0
    timeslot 5
     phys_chan_config TCH/H