Configure bsc and msc to connect to the specific stp provided in test

Change-Id: I89deaa71956131766fec8fcc3bc7381ebb0e187f
diff --git a/suites/aoip_encryption/register_a5_0_authopt.py b/suites/aoip_encryption/register_a5_0_authopt.py
index f528742..75614e2 100755
--- a/suites/aoip_encryption/register_a5_0_authopt.py
+++ b/suites/aoip_encryption/register_a5_0_authopt.py
@@ -5,9 +5,9 @@
 bts = suite.bts()
 mgcpgw = suite.mgcpgw(bts_ip=bts.remote_addr())
 mgw_bsc = suite.mgw()
-msc = suite.msc(hlr, mgcpgw)
-bsc = suite.bsc(msc, mgw_bsc)
 stp = suite.stp()
+msc = suite.msc(hlr, mgcpgw, stp)
+bsc = suite.bsc(msc, mgw_bsc, stp)
 ms = suite.modem()
 
 print('start network...')