Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 415710)
+++ channels/chan_sip.c	(working copy)
@@ -18392,14 +18392,15 @@
 					      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, *of, *name, *unused_password, *domain;
 	enum check_auth_result res = AUTH_DONT_KNOW;
 	char calleridname[256];
 	char *uri2 = ast_strdupa(uri);
 
 	terminate_uri(uri2);	/* trim extra stuff */
 
-	ast_copy_string(from, sip_get_header(req, "From"), sizeof(from));
+	from = ast_strdupa(sip_get_header(req, "From"));
+	from = ast_strdupa(sip_get_header(req, "From"));
 	/* XXX here tries to map the username for invite things */
 
 	/* strip the display-name portion off the beginning of the FROM header. */
@@ -18480,8 +18481,7 @@
 		}
 
 		if (!ast_strlen_zero(hdr) && (hdr = strstr(hdr, "username=\""))) {
-			ast_copy_string(from, hdr + strlen("username=\""), sizeof(from));
-			name = from;
+			name = ast_strdupa(hdr + strlen("username=\""));
 			name = strsep(&name, "\"");
 		}
 	}