diff --git a/bts/BTS_Tests_VAMOS.ttcn b/bts/BTS_Tests_VAMOS.ttcn
index 3498c61aa..637a2567c 100644
--- a/bts/BTS_Tests_VAMOS.ttcn
+++ b/bts/BTS_Tests_VAMOS.ttcn
@@ -174,6 +174,9 @@ runs on test_CT {
 		for (var integer ch := 0; ch < lengthof(test[i]); ch := ch + 1) {
 			pars[ch] := valueof(t_Pars(test[i][ch].chan_nr,
 						   test[i][ch].chan_mode));
+			if (test[i][ch].chan_mode.coding_alg_rate == RSL_CMOD_SP_GSM3) {
+				pars[ch].mr_conf := valueof(ts_RSL_MultirateCfg(false, 0, '00000100'B /* 5,90k */));
+			}
 			vc_conn[ch] := f_start_handler(handler, pars[ch], l1ctl := false);
 		}