---
title: "VX Won't Pass the \"+\" Symbol (E.164 Compliance)"
slug: "vx-wont-pass-the-symbol-e164-compliance"
updated: 2024-12-19T07:15:37Z
published: 2024-12-19T07:15:37Z
canonical: "docs.telosalliance.com/vx-wont-pass-the-symbol-e164-compliance"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.telosalliance.com/llms.txt
> Use this file to discover all available pages before exploring further.

# VX Won't Pass the "+" Symbol (E.164 Compliance)

## Problem

The VX Enterprise or VX Prime Plus running firmware 1.1.0.3 or earlier does not properly register to PBXs or providers that conform to the E.164 standard.

This is caused by registration strings that convert the "+" symbol to "%2B". For example, "+12162417225" is sent as "%2B12162417225", resulting in a failed registration attempt.

## Solution

This issue was addressed and fixed in a later release of firmware. At the time this article was written (May 2022), the latest release is 1.3.1, and can be found [here](/v1/docs/update-instructions-and-release-notes-for-vx-enterprise-and-prime-v133).

## Let us know how we can help

If you have further questions on this topic or have ideas about improving this document, please [contact us](https://www.telosalliance.com/support-request).