--- res/res_srtp.c	(Asterisk 16.10)
+++ res/res_srtp.c	(working copy)
@@ -865,2 +865,10 @@ int ast_sdp_crypto_process(struct ast_rt
 
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_TAG_8);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_TAG_16);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_TAG_32);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_TAG_80);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_AES_192);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_AES_256);
+	ast_clear_flag(srtp, AST_SRTP_CRYPTO_OLD_NAME);
+
 	if (!strcmp(suite, "AES_CM_128_HMAC_SHA1_80")) {