Index: channels/chan_sip.c
===================================================================
--- channels/chan_sip.c	(revision 258227)
+++ channels/chan_sip.c	(working copy)
@@ -24995,19 +24995,23 @@
 					}
 				}
 			} else if (!strcasecmp(v->name, "defaultip")) {
-				if (ast_get_ip(&peer->defaddr, v->value)) {
+				if (!ast_strlen_zero(v->value) && ast_get_ip(&peer->defaddr, v->value)) {
 					unref_peer(peer, "unref_peer: from build_peer defaultip");
 					return NULL;
 				}
 			} else if (!strcasecmp(v->name, "permit") || !strcasecmp(v->name, "deny")) {
 				int ha_error = 0;
-				peer->ha = ast_append_ha(v->name, v->value, peer->ha, &ha_error);
+				if(!ast_strlen_zero(v->value)) {
+					peer->ha = ast_append_ha(v->name, v->value, peer->ha, &ha_error);
+				}
 				if (ha_error) {
 					ast_log(LOG_ERROR, "Bad ACL entry in configuration line %d : %s\n", v->lineno, v->value);
 				}
 			} else if (!strcasecmp(v->name, "contactpermit") || !strcasecmp(v->name, "contactdeny")) {
 				int ha_error = 0;
-				peer->contactha = ast_append_ha(v->name + 7, v->value, peer->contactha, &ha_error);
+				if(!ast_strlen_zero(v->value)) {
+					peer->contactha = ast_append_ha(v->name + 7, v->value, peer->contactha, &ha_error);
+				}
 				if (ha_error) {
 					ast_log(LOG_ERROR, "Bad ACL entry in configuration line %d : %s\n", v->lineno, v->value);
 				}