How to Configure a VoIP Phone System — Step by Step

What You Need Before You Start

• A broadband connection — FTTC or FTTP both work. Minimum 2Mbps upload for up to 10 calls.
• A VoIP provider — like Telexico, who supplies SIP credentials and manages your numbers.
• A VoIP device — IP desk phone, softphone app on your computer, or mobile app.
• A router with QoS — Quality of Service settings prioritise voice traffic. Most modern business routers support this.

Step 1: Set Up Your Router for VoIP

Voice quality depends on your router giving VoIP traffic priority over other data. Without this, calls can sound choppy when someone else on the network is downloading a file.

• Log into your router admin panel (usually 192.168.1.1 or 192.168.0.1)
• Find the QoS (Quality of Service) settings
• Set SIP traffic (port 5060) and RTP traffic (ports 10000–20000) to highest priority
• Assign a static IP to your VoIP phone or device if possible

Step 2: Register Your VoIP Device with Your Provider

Your VoIP provider will give you SIP credentials — a SIP username, password and SIP server address. These are entered into your device to register it with the network.

For an IP Desk Phone (e.g. Yealink):

• Connect phone to your network via ethernet cable
• Find the phone's IP address (shown in Status menu)
• Open that IP address in your browser
• Navigate to Account → Register
• Enter SIP Server, Username and Password from your provider
• Save and wait for "Registered" status

For a Softphone App (e.g. Zoiper, Linphone):

• Download and install the app
• Add a new SIP account
• Enter the SIP server domain, username and password
• Enable the account — status should show "Registered"

Step 3: Configure Your Call Routing

Call routing determines what happens when someone calls your business number — which phones ring, in what order, and what happens if no one answers.

• Ring all phones simultaneously — everyone's phone rings at once
• Hunt group — try phone 1, then phone 2, then phone 3 in sequence
• Auto attendant — "Press 1 for Sales, 2 for Support" menu before routing
• Time-based routing — different routing during/outside business hours

Step 4: Set Up Your Auto Attendant & Voicemail

Your VoIP provider's portal lets you record or upload a professional greeting, configure the menu options and set voicemail-to-email so missed calls arrive as audio files in your inbox.

Step 5: Test Everything

• Call your business number from a mobile — does it ring correctly?
• Test each extension individually
• Test the voicemail — does it record and email the audio file?
• Test call quality — make a 5-minute call and check for any dropouts
• Test failover — if applicable, disconnect broadband and verify 4G backup activates