diff --git a/suites/voice/mo_mt_call.py b/suites/voice/mo_mt_call.py
index 46c5ec8..fa3b900 100755
--- a/suites/voice/mo_mt_call.py
+++ b/suites/voice/mo_mt_call.py
@@ -21,6 +21,7 @@
 bsc.start()
 
 bts.start()
+wait(bsc.bts_is_connected, bts)
 
 hlr.subscriber_add(ms_mo)
 hlr.subscriber_add(ms_mt)