Generic ATA Setup

This guide works with most SIP-compatible ATAs including Cisco, Linksys, Polycom, and others. The exact menu names may differ, but the settings are similar across devices.

Your SIP Credentials

You'll need these details when configuring your ATA.

SIP Server: sip.faxsimile.net
Port: 5060
Username: (sign in to see)
Password: (sign in to see)

Step 1: Connect the Hardware

  1. Connect the ATA to your router using an ethernet cable (usually goes in the "WAN" or "Internet" port)
  2. Connect your fax machine to the ATA's phone port (usually labeled "Phone", "FXS", or "Line")
  3. Plug in the ATA's power adapter
  4. Wait for the device to fully boot (1-2 minutes)

Step 2: Access the Web Interface

Most ATAs have a web interface for configuration. You'll need to find the device's IP address.

Common methods to find the IP:

Once you have the IP, enter it in your web browser (e.g., http://192.168.1.105)

Step 3: Configure SIP Settings

Look for sections labeled "SIP", "VoIP", "Service Provider", or "Line 1". Enter these settings:

SIP Server / Proxy / Domain sip.faxsimile.net
Outbound Proxy sip.faxsimile.net (or leave blank)
SIP Port 5060
Username / User ID / Number your extension
Auth Username / Auth ID your extension
Password / Auth Password your password
Registration / Enable SIP Yes / Enabled

Step 4: Optimize for Fax

Fax machines are sensitive to audio quality. These settings help ensure reliable transmission. Look for these in "Audio", "Codec", or "Advanced" settings:

Preferred Codec / Audio Codec G.711u (PCMU) or G.711a (PCMA)
Fax Mode / Fax Protocol T.38 (preferred) or G.711 passthrough
Silence Suppression / VAD Disabled / No / Off
Echo Cancellation Disabled / No / Off
Jitter Buffer Fixed (if available)
Comfort Noise Disabled / No / Off

Not all ATAs have all these settings - just configure what's available.

Step 5: Save and Test

  1. Save/Apply your settings
  2. Reboot the ATA (usually in System or Maintenance menu)
  3. Wait for it to restart (1-2 minutes)
  4. Look for a "Registered" status or solid LED indicator
  5. Make sure your fax machine is on and set to auto-answer

Check Your Connection

Once configured, your ATA should register with our server and show as online on your dashboard.

Check Dashboard Status

Common Issues

Not registering / No connection
  • Double-check credentials - copy/paste to avoid typos
  • Make sure "Registration" or "Enable" is turned on
  • Check that port 5060 isn't blocked by your router/firewall
  • Try rebooting both the ATA and your router
Faxes fail or have poor quality
  • Ensure G.711 codec is selected (not a compressed codec like G.729)
  • Disable all "enhancement" features: silence suppression, echo cancellation, comfort noise
  • If T.38 doesn't work, try G.711 passthrough mode instead
  • Reduce fax machine speed to 9600 baud if possible
One-way audio or no ring
  • Check that your router isn't blocking SIP/RTP ports
  • Enable "STUN" if your ATA supports it
  • Some routers have "SIP ALG" - try disabling it

Need More Help?

If you're stuck, try searching for "[Your ATA model] SIP setup guide" - there are many tutorials online for specific devices.

Or email us at help@faxsimile.net with your ATA model and we'll try to help.