diff --git a/YSFConvolution.cpp b/YSFConvolution.cpp
index 8de7045..9d62ba8 100644
--- a/YSFConvolution.cpp
+++ b/YSFConvolution.cpp
@@ -40,7 +40,7 @@ m_dp(NULL)
 {
 	m_metrics1  = new uint16_t[16U];
 	m_metrics2  = new uint16_t[16U];
-	m_decisions = new uint64_t[100U];
+	m_decisions = new uint64_t[360U];
 }
 
 CYSFConvolution::~CYSFConvolution()
diff --git a/YSFDefines.h b/YSFDefines.h
index 1c83fd2..ea45778 100644
--- a/YSFDefines.h
+++ b/YSFDefines.h
@@ -32,6 +32,16 @@ const unsigned char YSF_DT_TERMINATOR_CHANNEL = 0x80U;
 
 const unsigned char YSF_CKSUM_OK = 0x01U;
 
+const unsigned char YSF_FI_HEADER         = 0x00U;
+const unsigned char YSF_FI_COMMUNICATIONS = 0x40U;
+const unsigned char YSF_FI_TERMINATOR     = 0x80U;
+const unsigned char YSF_FI_TEST           = 0xC0U;
+
+const unsigned char YSF_DT_VD_MODE1      = 0x00U;
+const unsigned char YSF_DT_DATA_FR_MODE  = 0x10U;
+const unsigned char YSF_DT_VD_MODE2      = 0x20U;
+const unsigned char YSF_DT_VOICE_FR_MODE = 0x30U;
+
 const unsigned char YSF_CM_GROUP      = 0x00U;
 const unsigned char YSF_CM_INDIVIDUAL = 0x0CU;