Sign in Get started

Groundwire SIP setup on iPhone and Android

Updated 2026-09-30 · By the ZuteSIP team (ZuteSIP Inc.)

Short answer: To set up Groundwire on iPhone, add a new generic SIP account, then enter your ZuteSIP SIP username, password and domain sip.zutesipdialer.com. Enable push notifications so calls arrive when the app is closed, keep G.711 codecs on, and your real number works on your iPhone.

Groundwire by Acrobits is a SIP softphone for iOS and Android sold as a one-time purchase. Its vendor states both versions support push notifications and background calling, which matters on iPhone where apps are suspended quickly.

What you need

  • A ZuteSIP number and its SIP credentials from the number's page.
  • Groundwire installed from the App Store or Google Play.
  • Notifications and microphone access allowed for Groundwire.

Groundwire settings for ZuteSIP

SettingValue
SIP server / domain / registrarsip.zutesipdialer.com
Username / auth ID<SIP_USERNAME> (from the number's page in the dashboard)
Password<SIP_PASSWORD> (from the same page)
Transport and portUDP or TCP 5060, TLS 5061
CodecsG.711 µ-law (PCMU) and A-law (PCMA)
AuthenticationSIP digest, per-number username + password
DTMFRFC 2833 (RTP events) or SIP INFO
Outbound proxyLeave empty

Step-by-step: add the account

  1. Open Groundwire and go to its account settings.
  2. Choose to add an account and select the generic SIP account type rather than a provider template.
  3. Enter a title, then <SIP_USERNAME> as the username and <SIP_PASSWORD> as the password.
  4. Enter sip.zutesipdialer.com as the domain.
  5. In the account's advanced options, set the transport (UDP, TCP or TLS on 5061) and make sure G.711 µ-law and A-law are allowed.
  6. Turn on incoming calls via push notifications in the account's incoming-call options.
  7. Save and check the registration indicator on the dialpad screen.

Why Groundwire suits iPhone users

Most SIP apps struggle on iPhone because iOS limits what an app may do in the background. Groundwire's push support is its headline feature: instead of the app keeping a connection open, a notification wakes it when a call arrives, which saves battery and keeps your ZuteSIP number reachable.

It is also a one-time purchase, according to Acrobits, which some people prefer to a subscription. The account setup is the same on Android, so a mixed household or team can use one app on both platforms.

Test push properly after setup: close the app completely, lock the phone, and call your ZuteSIP number from another line. If it rings, you are done. If it doesn't, re-check the push option inside the account, notification permission in iOS Settings, and Focus modes that may silence calls from apps.

Receiving calls on iPhone

iOS suspends apps in the background, so an ordinary registration stops receiving calls soon after you leave the app. Groundwire's push mode keeps the number reachable: calls arrive as a native call screen even when the app isn't open. If push doesn't work in your setup, forward calls from the ZuteSIP dashboard to another phone as a fallback.

Outbound caller ID

Groundwire shows your ZuteSIP number as caller ID for calls placed through that account. With more than one number added, choose the account on the dialpad before calling. Dial the full international number starting with the country code.

Troubleshooting Groundwire

  • Registration fails with 401 or 403: re-enter the username and password and confirm the domain is sip.zutesipdialer.com.
  • Audio only one way or none: try TCP transport and enable STUN/ICE in the account's network options; mobile carrier NAT is a frequent cause.
  • Calls connect then drop or are silent: limit codecs to PCMU and PCMA to avoid a mismatch.
  • Voice menus ignore the keypad: choose RFC 2833 for DTMF, or SIP INFO as an alternative.
  • No incoming calls when the app is closed: confirm push is enabled for the account and that iOS notifications are allowed.

Battery, data and call quality

With push enabled, Groundwire doesn't need a constant connection while idle, which helps battery life. During a call, G.711 uses roughly the same modest bandwidth on Wi-Fi or mobile data, so a weak signal matters more than the codec.

For the clearest audio, prefer Wi-Fi at home or in the office and keep the phone's Low Data Mode off during calls. If calls sound choppy when moving between Wi-Fi and mobile data, finish the call on one network before switching.

Frequently asked questions

Does Groundwire work on iPhone?

Yes. Groundwire is available for iOS and Android, according to Acrobits.

Will I get calls when Groundwire is closed?

The vendor says Groundwire supports push notifications and background calling; enable push for the account so incoming calls can reach you.

Is Groundwire a subscription?

Acrobits describes Groundwire as a one-time purchase. The ZuteSIP SIP credentials come with your number.

Can I use Groundwire on mobile data?

Yes, SIP works over Wi-Fi or mobile data. If audio is poor on mobile data, try TCP transport and enable STUN.

Can I keep my regular mobile number and use Groundwire?

Yes. Groundwire adds your ZuteSIP number alongside your SIM number; the two work independently.

Related pages

Sources