diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 17083c6a0f..4a45a96146 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -18701,9 +18701,9 @@ static enum check_auth_result check_user_full(struct sip_pvt *p, struct sip_requ
 					      int sipmethod, const char *uri, enum xmittype reliable,
 					      struct ast_sockaddr *addr, struct sip_peer **authpeer)
 {
-	char from[256] = "", *of, *name, *unused_password, *domain;
+	char from[256], *of, *name, *unused_password, *domain;
 	enum check_auth_result res = AUTH_DONT_KNOW;
-	char calleridname[50];
+	char calleridname[256];
 	char *uri2 = ast_strdupa(uri);
 
 	terminate_uri(uri2);	/* trim extra stuff */
diff --git a/channels/sip/reqresp_parser.c b/channels/sip/reqresp_parser.c
index 9ef4fee172..ac986aa595 100644
--- a/channels/sip/reqresp_parser.c
+++ b/channels/sip/reqresp_parser.c
@@ -806,7 +806,7 @@ AST_TEST_DEFINE(get_calleridname_test)
 int get_name_and_number(const char *hdr, char **name, char **number)
 {
 	char header[256];
-	char tmp_name[50];
+	char tmp_name[256];
 	char *tmp_number = NULL;
 	char *hostport = NULL;
 	char *dummy = NULL;