diff --git a/crypto/src/tls/SrtpProtectionProfile.cs b/crypto/src/tls/SrtpProtectionProfile.cs
index e81988e41..32eafe427 100644
--- a/crypto/src/tls/SrtpProtectionProfile.cs
+++ b/crypto/src/tls/SrtpProtectionProfile.cs
@@ -12,6 +12,12 @@ public abstract class SrtpProtectionProfile
         public const int SRTP_NULL_HMAC_SHA1_80 = 0x0005;
         public const int SRTP_NULL_HMAC_SHA1_32 = 0x0006;
 
+        /*
+         * draft-ietf-avt-dtls-srtp-00 3.2.2
+         */
+        public const int SRTP_AES256_CM_HMAC_SHA1_80 = 0x0003;
+        public const int SRTP_AES256_CM_HMAC_SHA1_32 = 0x0004;
+        
         /*
          * RFC 7714 14.2.
          */