diff --git a/test/sipauth.c b/test/sipauth.c
index 4c8d86b76..7ae8729a1 100644
--- a/test/sipauth.c
+++ b/test/sipauth.c
@@ -10,6 +10,57 @@
 #include <re_dbg.h>
 
 
+static const char *testv[] = {
+	/* without algorithm - default MD5 */
+	"SIP/2.0 401 Unauthorized\r\n"
+	"Via: SIP/2.0/TLS "
+	"10.0.0.1:37589;branch=z9hG4bK5625ce6f310a0fc8;rport=13718;"
+	"received=10.0.0.2\r\n"
+	"WWW-Authenticate: Digest realm=\"example.net\", "
+	"nonce=\"YZlVk2GZVGegVBZVKaMHpnxmUA+QyoSl\"\r\n"
+	"Content-Length: 0\r\n\r\n",
+
+	/* explicit MD5 */
+	"SIP/2.0 401 Unauthorized\r\n"
+	"Via: SIP/2.0/TLS "
+	"10.0.0.1:37589;branch=z9hG4bK5625ce6f310a0fc8;rport=13718;"
+	"received=10.0.0.2\r\n"
+	"WWW-Authenticate: Digest realm=\"example.net\", "
+	"algorithm=\"MD5\", "
+	"nonce=\"YZlVk2GZVGegVBZVKaMHpnxmUA+QyoSl\"\r\n"
+	"Content-Length: 0\r\n\r\n",
+
+	/* explicit SHA-256 */
+	"SIP/2.0 401 Unauthorized\r\n"
+	"Via: SIP/2.0/TLS "
+	"10.0.0.1:37589;branch=z9hG4bK5625ce6f310a0fc8;rport=13718;"
+	"received=10.0.0.2\r\n"
+	"WWW-Authenticate: Digest realm=\"example.net\", "
+	"algorithm=\"SHA-256\", "
+	"nonce=\"YZlVk2GZVGegVBZVKaMHpnxmUA+QyoSl\"\r\n"
+	"Content-Length: 0\r\n\r\n",
+
+	/* explicit SHA-256 qop */
+	"SIP/2.0 401 Unauthorized\r\n"
+	"Via: SIP/2.0/TLS "
+	"10.0.0.1:37589;branch=z9hG4bK5625ce6f310a0fc8;rport=13718;"
+	"received=10.0.0.2\r\n"
+	"WWW-Authenticate: Digest realm=\"example.net\", "
+	"algorithm=\"SHA-256\", "
+	"qop=\"auth\", "
+	"nonce=\"YZlVk2GZVGegVBZVKaMHpnxmUA+QyoS\"\r\n"
+	"Content-Length: 0\r\n\r\n"
+};
+
+
+static const char *testr[] = {
+	"algorithm=MD5",
+	"algorithm=MD5",
+	"algorithm=SHA-256",
+	"algorithm=SHA-256"
+};
+
+
 static int auth_handler(char **user, char **pass, const char *rlm, void *arg)
 {
 	(void)user;
@@ -30,14 +81,6 @@ static int test_sip_auth_encode(void)
 	struct sip_msg *msg = NULL;
 	const char met[]    = "REGISTER";
 	const char uri[]    = "<sip:user@host:5060;transport=udp>";
-	const char str_raw[] =
-		"SIP/2.0 401 Unauthorized\r\n"
-		"Via: SIP/2.0/TLS "
-		"10.0.0.1:37589;branch=z9hG4bK5625ce6f310a0fc8;rport=13718;"
-		"received=10.0.0.2\r\n"
-		"WWW-Authenticate: Digest realm=\"example.net\", "
-		"nonce=\"YZlVk2GZVGegVBZVKaMHpnxmUA+QyoSl\"\r\n"
-		"Content-Length: 0\r\n\r\n";
 
 	mb = mbuf_alloc(2048);
 	if (!mb)
@@ -49,36 +92,45 @@ static int test_sip_auth_encode(void)
 		return ENOMEM;
 	}
 
-	err = sip_auth_alloc(&auth, auth_handler, NULL, false);
-	TEST_ERR(err);
+	for (size_t i = 0; i < RE_ARRAY_SIZE(testv); i++) {
+		mbuf_rewind(mb);
+		mbuf_rewind(mb_enc);
 
-	err = mbuf_write_str(mb, str_raw);
-	TEST_ERR(err);
+		err = sip_auth_alloc(&auth, auth_handler, NULL, false);
+		TEST_ERR(err);
 
-	mbuf_set_pos(mb, 0);
+		err = mbuf_write_str(mb, testv[i]);
+		TEST_ERR(err);
 
-	err = sip_msg_decode(&msg, mb);
-	TEST_ERR(err);
+		mbuf_set_pos(mb, 0);
 
-	err = sip_auth_authenticate(auth, msg);
-	TEST_ERR(err);
+		err = sip_msg_decode(&msg, mb);
+		TEST_ERR(err);
 
-	err = sip_auth_encode(mb_enc, auth, met, uri);
-	TEST_ERR(err);
+		err = sip_auth_authenticate(auth, msg);
+		TEST_ERR(err);
 
-	mbuf_set_pos(mb_enc, 0);
-	mbuf_read_str(mb_enc, buf, mbuf_get_left(mb_enc));
+		err = sip_auth_encode(mb_enc, auth, met, uri);
+		TEST_ERR(err);
 
-	err = re_regex(buf, str_len(buf), "algorithm=MD5");
-	TEST_ERR(err);
+		mbuf_set_pos(mb_enc, 0);
+		mbuf_read_str(mb_enc, buf, mbuf_get_left(mb_enc));
+
+		err = re_regex(buf, str_len(buf), testr[i]);
+		TEST_ERR(err);
+
+		mem_deref(msg);
+		mem_deref(auth);
+	}
 
 out:
 	mem_deref(mb);
 	mem_deref(mb_enc);
-	if (msg)
+	if (err) {
 		mem_deref(msg);
-	if (auth)
 		mem_deref(auth);
+	}
+
 	return err;
 }