Index: channels/chan_iax2.c
===================================================================
--- channels/chan_iax2.c	(revision 228786)
+++ channels/chan_iax2.c	(working copy)
@@ -4597,7 +4597,7 @@
 	/* ----- Case 3 ----- */
 	} else { /* calltokens are not supported for this client, how do we respond? */
 		if (calltoken_required(sin, ies->username, subclass)) {
-			ast_log(LOG_ERROR, "Call rejected, CallToken Support required. If unexpected, resolve by placing address %s in the calltokenignore list or setting user %s requirecalltoken=no\n", ast_inet_ntoa(sin->sin_addr), ies->username);
+			ast_log(LOG_ERROR, "Call rejected, CallToken Support required. If unexpected, resolve by placing address %s in the calltokenoptional list or setting user %s requirecalltoken=no\n", ast_inet_ntoa(sin->sin_addr), ast_strlen_zero(ies->username) ? "UNKNOWN" : ies->username);
 			goto reject;
 		}
 		return 0; /* calltoken is not required for this addr, so permit it. */