diff --git a/libs/srtp/crypto/cipher/aes_icm.c b/libs/srtp/crypto/cipher/aes_icm.c
index 1f9bcbd97c..ff330ffd81 100644
--- a/libs/srtp/crypto/cipher/aes_icm.c
+++ b/libs/srtp/crypto/cipher/aes_icm.c
@@ -49,6 +49,9 @@
 #include "aes_icm.h"
 #include "alloc.h"
 
+#ifdef _MSC_VER
+#pragma warning(disable:4100)
+#endif
 
 debug_module_t mod_aes_icm = {
   0,                 /* debugging is off by default */
@@ -378,7 +381,7 @@ aes_icm_encrypt_ismacryp(aes_icm_ctx_t *c,
   for (i=0; i < (bytes_to_encr/sizeof(v128_t)); i++) {
 
     /* fill buffer with new keystream */
-    aes_icm_advance_ismacryp(c, forIsmacryp);
+    aes_icm_advance_ismacryp(c, (uint8_t)forIsmacryp);
 
     /*
      * add keystream into the data buffer (this would be a lot faster
@@ -426,7 +429,7 @@ aes_icm_encrypt_ismacryp(aes_icm_ctx_t *c,
   if ((bytes_to_encr & 0xf) != 0) {
     
     /* fill buffer with new keystream */
-    aes_icm_advance_ismacryp(c, forIsmacryp);
+    aes_icm_advance_ismacryp(c, (uint8_t)forIsmacryp);
     
     for (i=0; i < (bytes_to_encr & 0xf); i++)
       *buf++ ^= c->keystream_buffer.v8[i];
diff --git a/libs/srtp/crypto/cipher/cipher.c b/libs/srtp/crypto/cipher/cipher.c
index 27da651c72..f465ec6c5a 100644
--- a/libs/srtp/crypto/cipher/cipher.c
+++ b/libs/srtp/crypto/cipher/cipher.c
@@ -155,7 +155,7 @@ cipher_type_test(const cipher_type_t *ct, const cipher_test_case_t *test_data) {
 				     test_case->ciphertext_length_octets));
 
     /* compare the resulting ciphertext with that in the test case */
-    if (len != test_case->ciphertext_length_octets)
+    if (len != (unsigned int)test_case->ciphertext_length_octets)
       return err_status_algo_fail;
     status = err_status_ok;
     for (i=0; i < test_case->ciphertext_length_octets; i++)
@@ -222,7 +222,7 @@ cipher_type_test(const cipher_type_t *ct, const cipher_test_case_t *test_data) {
 				     test_case->plaintext_length_octets));
 
     /* compare the resulting plaintext with that in the test case */
-    if (len != test_case->plaintext_length_octets)
+    if (len != (unsigned int)test_case->plaintext_length_octets)
       return err_status_algo_fail;
     status = err_status_ok;
     for (i=0; i < test_case->plaintext_length_octets; i++)
@@ -344,7 +344,7 @@ cipher_type_test(const cipher_type_t *ct, const cipher_test_case_t *test_data) {
 		octet_string_hex_string(buffer, length));    
 
     /* compare the resulting plaintext with the original one */
-    if (length != plaintext_len)
+    if (length != (unsigned int)plaintext_len)
       return err_status_algo_fail;
     status = err_status_ok;
     for (i=0; i < plaintext_len; i++)
diff --git a/libs/srtp/crypto/cipher/null_cipher.c b/libs/srtp/crypto/cipher/null_cipher.c
index 724f4df3a8..d99a0e85af 100644
--- a/libs/srtp/crypto/cipher/null_cipher.c
+++ b/libs/srtp/crypto/cipher/null_cipher.c
@@ -48,6 +48,10 @@
 #include "null_cipher.h"
 #include "alloc.h"
 
+#ifdef _MSC_VER
+#pragma warning(disable:4100)
+#endif
+
 /* the null_cipher uses the cipher debug module  */
 
 extern debug_module_t mod_cipher;
diff --git a/libs/srtp/crypto/kernel/crypto_kernel.c b/libs/srtp/crypto/kernel/crypto_kernel.c
index 0e969bc860..90c4a3073a 100644
--- a/libs/srtp/crypto/kernel/crypto_kernel.c
+++ b/libs/srtp/crypto/kernel/crypto_kernel.c
@@ -300,7 +300,7 @@ crypto_kernel_shutdown() {
 static inline err_status_t
 crypto_kernel_do_load_cipher_type(cipher_type_t *new_ct, cipher_type_id_t id,
 				  int replace) {
-  kernel_cipher_type_t *ctype, *new_ctype;
+  kernel_cipher_type_t *ctype, *new_ctype = 0;
   err_status_t status;
 
   /* defensive coding */
@@ -370,7 +370,7 @@ crypto_kernel_replace_cipher_type(cipher_type_t *new_ct, cipher_type_id_t id) {
 err_status_t
 crypto_kernel_do_load_auth_type(auth_type_t *new_at, auth_type_id_t id,
 				int replace) {
-  kernel_auth_type_t *atype, *new_atype;
+  kernel_auth_type_t *atype, *new_atype = 0;
   err_status_t status;
 
   /* defensive coding */
diff --git a/libs/srtp/crypto/kernel/err.c b/libs/srtp/crypto/kernel/err.c
index 4a3a8589e9..6b00e7b877 100644
--- a/libs/srtp/crypto/kernel/err.c
+++ b/libs/srtp/crypto/kernel/err.c
@@ -50,6 +50,9 @@
 # endif
 #endif
 
+#ifdef _MSC_VER
+#pragma warning(disable:4100)
+#endif
 
 /*  err_level reflects the level of errors that are reported  */
 
diff --git a/libs/srtp/crypto/math/datatypes.c b/libs/srtp/crypto/math/datatypes.c
index 21c0dc0782..c329eb122b 100644
--- a/libs/srtp/crypto/math/datatypes.c
+++ b/libs/srtp/crypto/math/datatypes.c
@@ -152,7 +152,9 @@ hex_char_to_nibble(uint8_t c) {
   default: return -1;   /* this flags an error */
   }
   /* NOTREACHED */
+#ifndef WIN32
   return -1;  /* this keeps compilers from complaining */
+#endif
 }
 
 int
@@ -179,7 +181,7 @@ hex_string_to_octet_string(char *raw, char *hex, int len) {
     tmp = hex_char_to_nibble(hex[0]);
     if (tmp == -1)
       return hex_len;
-    x = (tmp << 4);
+    x = (uint8_t)(tmp << 4);
     hex_len++;
     tmp = hex_char_to_nibble(hex[1]);
     if (tmp == -1)
@@ -704,7 +706,7 @@ base64_string_to_octet_string(char *raw, char *base64, int len) {
     tmp = base64_char_to_sextet(base64[0]);
     if (tmp == -1)
       return base64_len;
-    x = (tmp << 6);
+    x = (uint8_t)(tmp << 6);
     base64_len++;
     tmp = base64_char_to_sextet(base64[1]);
     if (tmp == -1)
diff --git a/libs/srtp/crypto/math/stat.c b/libs/srtp/crypto/math/stat.c
index 5e46c209e3..a744f91f88 100644
--- a/libs/srtp/crypto/math/stat.c
+++ b/libs/srtp/crypto/math/stat.c
@@ -24,7 +24,7 @@ debug_module_t mod_stat = {
 err_status_t
 stat_test_monobit(uint8_t *data) {
   uint8_t *data_end = data + STAT_TEST_DATA_LEN;
-  uint16_t ones_count;
+  int ones_count;
 
   ones_count = 0;
   while (data < data_end) {
diff --git a/libs/srtp/crypto/replay/rdbx.c b/libs/srtp/crypto/replay/rdbx.c
index 54671cab0c..f13e334bf8 100644
--- a/libs/srtp/crypto/replay/rdbx.c
+++ b/libs/srtp/crypto/replay/rdbx.c
@@ -292,7 +292,7 @@ rdbx_add_index(rdbx_t *rdbx, int delta) {
   
   if (delta > 0) {
     /* shift forward by delta */
-    index_advance(&rdbx->index, delta);
+    index_advance(&rdbx->index, (sequence_number_t)delta);
     bitvector_left_shift(&rdbx->bitmask, delta);
     bitvector_set_bit(&rdbx->bitmask, bitvector_get_length(&rdbx->bitmask) - 1);
   } else {
diff --git a/libs/srtp/crypto/replay/ut_sim.c b/libs/srtp/crypto/replay/ut_sim.c
index 43c411e46b..465e8c85ca 100644
--- a/libs/srtp/crypto/replay/ut_sim.c
+++ b/libs/srtp/crypto/replay/ut_sim.c
@@ -47,6 +47,9 @@
 
 #include "ut_sim.h"
 
+#ifdef _MSC_VER
+#pragma warning(disable:4100)
+#endif
 
 int
 ut_compar(const void *a, const void *b) {
diff --git a/libs/srtp/srtp/srtp.c b/libs/srtp/srtp/srtp.c
index 163d0d1f3f..a1f1fc8327 100644
--- a/libs/srtp/srtp/srtp.c
+++ b/libs/srtp/srtp/srtp.c
@@ -838,7 +838,7 @@ srtp_stream_init(srtp_stream_ctx_t *srtp,
     * estimate the packet index using the start of the replay window   
     * and the sequence number from the header
     */
-   delta = rdbx_estimate_index(&stream->rtp_rdbx, &est, ntohs(hdr->seq));
+   delta = rdbx_estimate_index(&stream->rtp_rdbx, &est, ntohs((uint16_t)hdr->seq));
    status = rdbx_check(&stream->rtp_rdbx, delta);
    if (status) {
      if (status != err_status_replay_fail || !stream->allow_repeat_tx)
@@ -999,7 +999,7 @@ srtp_unprotect(srtp_ctx_t *ctx, void *srtp_hdr, int *pkt_octet_len) {
       est = (xtd_seq_num_t) make64(0,ntohs(hdr->seq));
       delta = low32(est);
 #else
-      est = (xtd_seq_num_t) ntohs(hdr->seq);
+      est = (xtd_seq_num_t) ntohs((uint16_t)hdr->seq);
       delta = (int)est;
 #endif
     } else {
@@ -1013,7 +1013,7 @@ srtp_unprotect(srtp_ctx_t *ctx, void *srtp_hdr, int *pkt_octet_len) {
   } else {
   
     /* estimate packet index from seq. num. in header */
-    delta = rdbx_estimate_index(&stream->rtp_rdbx, &est, ntohs(hdr->seq));
+    delta = rdbx_estimate_index(&stream->rtp_rdbx, &est, ntohs((uint16_t)hdr->seq));
     
     /* check replay database */
     status = rdbx_check(&stream->rtp_rdbx, delta);