diff --git a/app/extensions/v_extensions_edit.php b/app/extensions/v_extensions_edit.php
index 6d18f86aa0..38950626a6 100644
--- a/app/extensions/v_extensions_edit.php
+++ b/app/extensions/v_extensions_edit.php
@@ -1268,7 +1268,7 @@ if (count($_POST)>0 && strlen($_POST["persistformvar"]) == 0) {
 	echo "    Dial String:\n";
 	echo "</td>\n";
 	echo "<td class='vtable' align='left'>\n";
-	echo "    <input class='formfld' type='text' name='dial_string' maxlength='255' value=\"$dial_string\">\n";
+	echo "    <input class='formfld' type='text' name='dial_string' maxlength='4096' value=\"$dial_string\">\n";
 	echo "<br />\n";
 	echo "Location of the endpoint.\n";
 	echo "</td>\n";