---
title: "How do I set up Groundwire with VoIP.ms?"
topic: "SIP Providers"
updated: 2026-07-09
canonical: https://acrobits.net/resources/knowledge-base/how-do-i-set-up-groundwire-with-voip-ms/
summary: "Groundwire ships with a built-in VoIP.ms preconfiguration, so you don't enter SIP server settings manually. Pick VoIP.ms from the provider list, enter your account credentials, and you're done. Many users can be making and receiving calls within minutes. For a plain-English look at the provider itself, including pricing, reliability, and how it pairs with the app, see our VoIP.ms review."
---

# How do I set up Groundwire with VoIP.ms?

> Groundwire ships with a built-in VoIP.ms preconfiguration, so you don't enter SIP server settings manually. Pick VoIP.ms from the provider list, enter your account credentials, and you're done. Many users can be making and receiving calls within minutes. For a plain-English look at the provider itself, including pricing, reliability, and how it pairs with the app, see our VoIP.ms review.

[**Groundwire**](/sip-client-ios-android/) ships with a built-in VoIP.ms preconfiguration, so you don't enter SIP server settings manually. Pick VoIP.ms from the provider list, enter your account credentials, and you're done. Many users can be making and receiving calls within minutes. For a plain-English look at the provider itself, including pricing, reliability, and how it pairs with the app, see our [VoIP.ms review](/blog/groundwire/voip-ms-review/).

## What you need for Groundwire with VoIP.ms

  - A VoIP.ms account with at least one DID purchased

  - A sub-account created in the VoIP.ms portal (recommended over using the main account)

  - Groundwire installed on iOS or Android

## Create a VoIP.ms sub-account

  - Log into the VoIP.ms portal → **Sub Accounts → Create Sub Account**.

  - Set a username (format: 123456_yourname, where 123456 is your main account number) and a strong password.

  - Set **Auth Type** to "User/Password Authentication".

  - Set **NAT** to *Yes* (recommended; handles routing for mobile networks).

  - Enable **Encrypted SIP Traffic** for TLS + SRTP on SIP signaling and media, especially on public Wi-Fi.

  - Assign your DID to route to this sub-account under **DID Numbers → Manage DID**.

## Add VoIP.ms to Groundwire

  - Open Groundwire → **Settings → Accounts → Add account**.

  - Search the provider list for **VoIP.ms** and select it. Groundwire pre-fills the SIP server and ports for you.

  - Pick the regional server closest to you (e.g. denver1.voip.ms, atlanta1.voip.ms, london.voip.ms). Match this to the POP you selected in the VoIP.ms portal.

  - Enter the sub-account username (e.g. 123456_yourname) and password.

  - Save. The registration indicator should turn green within seconds.

## Set codecs and transport

Groundwire defaults to **G.711u (PCMU)**, which is what VoIP.ms recommends for North American calling. If you have limited bandwidth or are on cellular data, enable G.729a as a fallback. For HD calling between two Groundwire users on Wi-Fi, enable G.722.

Transport: UDP on port 5060 by default. Switch to TLS on port 5061 if you enabled "Encrypted SIP Traffic" in the VoIP.ms portal.

## Why Groundwire works well with VoIP.ms

VoIP.ms [recommends Acrobits](https://blog.voip.ms/blog/which-softphone-is-the-best-for-you/) alongside Bria, Zoiper, Linphone, and Grandstream Wave. Reasons many VoIP.ms users choose Groundwire:

  - **Built-in VoIP.ms preconfig**: no manual SIP server entry.

  - **SIPIS** (Acrobits' SIP push server): your phone rings even when Groundwire is closed. Many free softphones have more limited push support on iOS and modern Android.

  - **One-time $9.99 purchase**: no subscription, with updates included. Bria's mobile app is subscription-only at $4.95+/month.

  - **Multiple SIP accounts**: VoIP.ms alongside Twilio, a work PBX, or other providers in one app.

  - **ZRTP, SRTP, and TLS**: all user-controlled encryption.

## Troubleshoot Groundwire with VoIP.ms

  - **Registration failing**: wrong sub-account username format. Use mainaccount_subaccount, not just the sub-account name.

  - **One-way audio**: ensure NAT = Yes in the VoIP.ms sub-account settings; this is often needed on cellular.

  - **Calls connect but don't ring through to phone**: confirm the DID is routed to the sub-account in **Manage DID → Routing**.

  - **App doesn't ring when closed**: confirm push is enabled in Groundwire and at the OS level.

## Cost of Groundwire with VoIP.ms

ComponentCost

Groundwire (one-time)$9.99
VoIP.ms US DID~$0.85 / month
Outbound US calls$0.01 / min
Inbound US calls$0.009 / min
Typical light user~$2–3 / month

## Bottom line

VoIP.ms + Groundwire is a low-cost mobile phone setup with SIP control, encryption, and push.

**Also worth reading:** [is Groundwire worth paying for vs free softphones?](/blog/groundwire/is-groundwire-worth-paying-for-vs-free-softphones/) and [is Groundwire secure?](/resources/knowledge-base/is-groundwire-secure/)

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