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asterisk: TC_internal_call_all_Nregistered: Answer Cancel when received

Otherwise CANCEL is not answered until the MO+MT SIP UAs have fully
established the call, which causes Asterisk to retransmit the CANCEL
several times.

Change-Id: I72e9ecaf58156f3fe62c4fb2d8c74c82ab16aa78
---
M asterisk/Asterisk_Tests.ttcn
1 file changed, 23 insertions(+), 7 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/91/37491/1

diff --git a/asterisk/Asterisk_Tests.ttcn b/asterisk/Asterisk_Tests.ttcn
index 71d3576..916339a 100644
--- a/asterisk/Asterisk_Tests.ttcn
+++ b/asterisk/Asterisk_Tests.ttcn
@@ -373,16 +373,19 @@
 
 	/* Make sure the desired MT is the one picking up first the call: */
 	COORD.send(COORD_CMD_PICKUP) to vc_conn_list[vc_conn_mt_idx];
-	interleave {
-	[] COORD.receive(COORD_CMD_CALL_ESTABLISHED) from vc_conn_list[vc_conn_mo_idx];
-	[] COORD.receive(COORD_CMD_CALL_ESTABLISHED) from vc_conn_list[vc_conn_mt_idx];
-	}
-
-	/* Pick up from other phone calls and expect CANCEL: */
 	for (var integer i := 0; i < num_conns; i := i + 1) {
 		if (i != vc_conn_mo_idx and i != vc_conn_mt_idx) {
 			COORD.send(COORD_CMD_PICKUP) to vc_conn_list[i];
-			COORD.receive(COORD_CMD_CALL_CANCELLED) from vc_conn_list[i];
+		}
+	}
+
+	/* Pick up from other phone calls and expect CANCEL: */
+	var boolean wait_mo := true, wait_mt := true;
+	for (var integer i := 0; i < num_conns; i := i + 1) {
+		alt {
+		[wait_mo] COORD.receive(COORD_CMD_CALL_ESTABLISHED) from vc_conn_list[vc_conn_mo_idx] { wait_mo := false };
+		[wait_mt] COORD.receive(COORD_CMD_CALL_ESTABLISHED) from vc_conn_list[vc_conn_mt_idx] { wait_mt := false };
+		[] COORD.receive(COORD_CMD_CALL_CANCELLED);
 		}
 	}
 

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