diff --git a/doc/msc_tests_aoip.dot b/doc/msc_tests_aoip.dot
index 06359f7..c799844 100644
--- a/doc/msc_tests_aoip.dot
+++ b/doc/msc_tests_aoip.dot
@@ -35,7 +35,7 @@
 		shape = "record"
 		label = "<f0> MNCC_Emulation_CT | <MNCC_CLIENT> MNCC_CLIENT | <MNCC_PROC> MNCC_PROC | <MNCC> MNCC"
 	]
-	"MNCC_Emulation_CT":MNCC -> "system":UD
+	"MNCC_Emulation_CT":MNCC -> "system":UD [label="MNCC_CODEC_PT"]
 	"BSC_ConnHdlr":MNCC -> "MNCC_Emulation_CT":MNCC_CLIENT
 	"BSC_ConnHdlr":MNCC_PROC -> "MNCC_Emulation_CT":MNCC_PROC
 
@@ -53,7 +53,7 @@
 		shape = "record"
 		label = "<f0> MGCP_Emulation_CT | <MGCP_CLIENT> MGCP_CLIENT | <MGCP_PROC> MGCP_PROC | <MGCP_CLIENT_MULTI> MGCP_CLIENT_MULTI | <MGCP> MGCP"
 	]
-	"MGCP_Emulation_CT":MGCP -> "system":IPL4
+	"MGCP_Emulation_CT":MGCP -> "system":IPL4 [label="MGCP_CODEC_PT"]
 	"MGCP_Emulation_CT":MGCP -> "IPA_Emulation_CT":IPA_MGCP_PORT
 	"BSC_ConnHdlr":MGCP -> "MGCP_Emulation_CT":MGCP_CLIENT
 	"BSC_ConnHdlr":MGCP_PROC -> "MGCP_Emulation_CT":MGCP_PROC
@@ -63,7 +63,7 @@
 		shape = "record"
 		label = "<f0> SMPP_Emulation_CT | <SMPP_CLIENT> SMPP_CLIENT | <SMPP_PROC> SMPP_PROC | <SMPP_PORT> SMPP_PORT"
 	]
-	"SMPP_Emulation_CT":SMPP_PORT -> "system":IPL4
+	"SMPP_Emulation_CT":SMPP_PORT -> "system":IPL4 [label="SMPP_CODEC_PT"]
 	"BSC_ConnHdlr":SMPP -> "SMPP_Emulation_CT":SMPP_CLIENT
 	"BSC_ConnHdlr":SMPP_PROC -> "SMPP_Emulation_CT":SMPP_PROC
 
@@ -71,7 +71,7 @@
 		shape = "record"
 		label = "<f0> SGsAP_Emulation_CT | <SGsAP_CLIENT> SGsAP_CLIENT | <SGsAP_PROC> SGsAP_PROC | <SGsAP_UNIT> SGsAP_UNIT | <SGsAP> SGsAP"
 	]
-	"SGsAP_Emulation_CT":SGsAP -> "system":IPL4
+	"SGsAP_Emulation_CT":SGsAP -> "system":IPL4 [label="SGsAP_CODEC_PT"]
 	"BSC_ConnHdlr":SGsAP -> "SGsAP_Emulation_CT":SGsAP_CLIENT
 	"BSC_ConnHdlr":SGsAP_PROC -> "SGsAP_Emulation_CT":SGsAP_PROC
 
@@ -79,7 +79,7 @@
 		shape = "record"
 		label = "<f0> IPA_Emulation_CT | <MTP3_SP_PORT> MTP3_SP_PORT | <IPA_MGCP_PORT> IPA_MGCP_PORT | <IPA_RSL_PORT> IPA_RSL_PORT | <IPA_OML_PORT> IPA_OML_PORT | <IPA_CTRL_PORT> IPA_CTRL_PORT | <IPA_GSUP_PORT> IPA_GSUP_PORT | <IPA_RSPRO_PORT> IPA_RSPRO_PORT | <IPA_OSMO_PCU_PORT> IPA_OSMO_PCU_PORT | <IPA_SP_PORT> IPA_SP_PORT | <IPA_PORT> IPA_PORT"
 	];
-	"IPA_Emulation_CT":IPA_PORT -> "system":IPL4
+	"IPA_Emulation_CT":IPA_PORT -> "system":IPL4 [label="IPA_CODEC_PT"]
 
 
 	"system" [