--- asterisk-1.6.1.4.orig/res/res_config_ldap.c	2009-08-10 23:40:36.000000000 +0200
+++ asterisk-1.6.1.4/res/res_config_ldap.c	2009-08-12 14:10:39.000000000 +0200
@@ -1228,16 +1228,21 @@
 			mods_size++;
 			ldap_mods = ast_realloc(ldap_mods, sizeof(LDAPMod *) * mods_size);
 			ldap_mods[mods_size - 1] = NULL;
+			
 			ldap_mods[mods_size - 2] = ast_calloc(1, sizeof(LDAPMod));
 
-			ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_REPLACE;
-
 			ldap_mods[mods_size - 2]->mod_type = ast_calloc(sizeof(char), strlen(newparam) + 1);
 			strcpy(ldap_mods[mods_size - 2]->mod_type, newparam);
 
-			ldap_mods[mods_size - 2]->mod_values = ast_calloc(sizeof(char *), 2);
-			ldap_mods[mods_size - 2]->mod_values[0] = ast_calloc(sizeof(char), strlen(newval) + 1);
-			strcpy(ldap_mods[mods_size - 2]->mod_values[0], newval);
+			if (strlen(newval) == 0) {
+				ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_DELETE;
+			} else {
+				ldap_mods[mods_size - 2]->mod_op = LDAP_MOD_REPLACE;
+
+				ldap_mods[mods_size - 2]->mod_values = ast_calloc(sizeof(char *), 2);
+				ldap_mods[mods_size - 2]->mod_values[0] = ast_calloc(sizeof(char), strlen(newval) + 1);
+				strcpy(ldap_mods[mods_size - 2]->mod_values[0], newval);
+			}
 		}
 	}
 	/* freeing ldap_mods further down */