diff --git a/library/MGCP_Templates.ttcn b/library/MGCP_Templates.ttcn
index 34bbbc9..6d2a689 100644
--- a/library/MGCP_Templates.ttcn
+++ b/library/MGCP_Templates.ttcn
@@ -59,7 +59,7 @@
 			t_MgcpParConnMode(mode),
 			ts_MgcpParCallId(call_id),
 			//t_MgcpParReqId(omit),
-			t_MgcpParLocConnOpt("p:20, a:PCMU")
+			t_MgcpParLocConnOpt("p:20, a:AMR")
 		},
 		sdp := sdp
 	}
@@ -97,7 +97,7 @@
 			ts_MgcpParCallId(call_id),
 			ts_MgcpParConnectionId(conn_id),
 			//t_MgcpParReqId(omit),
-			t_MgcpParLocConnOpt("p:20, a:PCMU")
+			t_MgcpParLocConnOpt("p:20, a:AMR")
 		},
 		sdp := sdp
 	}