diff --git a/mgw/MGCP_Test.ttcn b/mgw/MGCP_Test.ttcn
index 0de5308..be4e634 100644
--- a/mgw/MGCP_Test.ttcn
+++ b/mgw/MGCP_Test.ttcn
@@ -2082,8 +2082,12 @@
 		setverdict(pass);
 	}
 
+	/* Note: The hexstrings used with the f_TC_amr_x_x_rtp_conversion test
+	 * functions are real world AMR RTP payloads including AMR header. The
+	 * payloads were extracted from a trace with known good payloads. */
+
 	testcase TC_amr_oa_bwe_rtp_conversion() runs on dummy_CT {
-		 f_TC_amr_x_x_rtp_conversion('100c4e9ba850e30d5d53d04de41e7c'O, '10d3a6ea1438c35754f41379079f'O, "octet-align=1", "octet-align=0");
+		f_TC_amr_x_x_rtp_conversion('2014e959f35fdfe5e9667ffbc088818088'O, '217a567cd7f7f97a599ffef022206022'O, "octet-align=1", "octet-align=0");
 	}
 
 	testcase TC_amr_oa_oa_rtp_conversion() runs on dummy_CT {