RemoSIM Remote SIM & VoIP Platform
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Mobile & Desktop SIP Softphones

In addition to our browser-based Web Softphone, you can install dedicated VoIP softphone apps on your smartphone or computer to answer and place calls through your remote SIM cards anywhere in the world.

Account Parameters Checklist

When setting up any softphone application, you will need the credentials configured in your Asterisk / FreePBX extension:

Parameter Description Example Value
Display Name Your name or caller ID John Doe
Username / Extension Asterisk Extension number 1001
Password / Secret SIP Secret for the extension <YOUR_SIP_PASSWORD>
SIP Server / Domain Server hostname and port sip.yourdomain.com:5060
Transport Network protocol UDP (or TLS if configured)
NAT Keep-Alive Keeps cellular firewall port open Always Send / Enabled

1. Apple iOS (iPhone)

We recommend either SessionTalk or Zoiper Lite on iOS for reliable push notifications and battery-efficient background operation.

  1. Install SessionTalk SIP Softphone from the App Store.
  2. Tap Settings → Manage Accounts → Add Account → Generic SIP.
  3. Configure the following fields:
    • Account Name: RemoSIM
    • Display Name: Your Name
    • User Name: Your Extension (e.g. 1001)
    • Password: Your SIP Secret
    • Domain / Host: sip.yourdomain.com:5060
  4. Under Advanced Settings:
    • IP Version: IPv4
    • UDP Keepalive: Enabled
  5. Tap Save. The account indicator turns green when registered.

Option B: Zoiper Lite on iOS

  1. Install Zoiper Lite from the App Store.
  2. Go to Settings → Accounts → + → Yes → Manual Configuration → SIP account.
  3. Enter your account details:
    • Account name: RemoSIM
    • Domain: sip.yourdomain.com:5060
    • User name: 1001
    • Password: Your SIP Secret
  4. Go to Network Settings and ensure Enable IPv6 is set to NO.

2. Android

Option A: Zoiper VoIP Client

  1. Install Zoiper IAX SIP VOIP Softphone from the Google Play Store.
  2. Open Zoiper and click Use free with ads (or enter your license).
  3. In the setup wizard:
    • Enter your username@sip.yourdomain.com:5060
    • Enter your SIP password
  4. Select SIP UDP as the transport provider.

Option B: Native Android SIP (Samsung/Google where available)

Some Android firmware builds contain a built-in SIP client:

  1. Open the stock Phone application.
  2. Tap the three dots menu → Settings → Calling accounts → SIP accounts.
  3. Tap + to add an account:
    • Username: Your Extension
    • Password: Your SIP Secret
    • Server: sip.yourdomain.com:5060
    • Under Optional settings, set Send keep-alive to Always send.

3. macOS (Apple Mac)

On macOS, the lightweight Telephone app is free and straightforward:

  1. Install Telephone from the Mac App Store.
  2. Open Telephone → Preferences → Accounts → +:
    • Full Name: Your Name
    • Domain: sip.yourdomain.com:5060
    • User Name: Your Extension
    • Password: Your SIP Secret
  3. Check Use this account. Once registered, the status bar will display Available:
Telephone App Connected
Telephone App showing "Available" state on macOS.

4. Windows & Linux Desktop

For Windows or Linux workstations, you can use Linphone or Jitsi Desktop:

  1. Download and run the installer for your operating system.
  2. Select Add a SIP Account:
    • SIP ID: 1001@sip.yourdomain.com
    • Password: Your SIP Secret
    • Proxy: sip.yourdomain.com:5060
    • Transport: UDP
SIP Setup on Desktop

5. Verifying Connection: Asterisk Echo Test

After configuring your softphone client, always verify two-way audio by placing an echo test call:

  1. Dial *43 on your softphone dialpad.
  2. Speak into your headset or microphone.
  3. You should hear your own voice echoed back immediately.
    • If you hear the prompt but not your voice, check microphone permissions.
    • If the call drops after 5 to 30 seconds or there is no audio in either direction, verify your RTP port forwarding (UDP ports 10000-20000) and STUN/TURN configuration.