✅ Step‑by‑Step: Check Your Desk Phone Cables

1. Check the Power Cable (If Not PoE)

Some phones use a power adapter, others get power from the network cable (PoE).

✔ If your phone has a power adapter:

• Find the round power plug on the back of your phone.
• Make sure it is firmly plugged into the phone.
• Ensure the power brick is plugged into the wall or surge protector.
• Look for lights on the phone to confirm it is getting power.

✔ If your phone uses PoE (no power adapter):

• Your Ethernet cable MUST connect to a PoE switch or router.
• If the screen does not turn on → your switch may not be providing power.

2. Check the Network Cable (Main Ethernet Cable)

This is the most important cable for VoIP audio issues.

On the back of the phone you will see:

• LAN or Internet port (this goes to the wall/switch)
• PC port (optional pass‑through to your computer)

Do this:

1. Find the cable going from the LAN / Internet port.
2. Make sure it is firmly clicked in and not loose.
3. Follow that cable to the wall jack, switch, or router and make sure it’s plugged in tightly as well.
4. Check for link lights(small green/orange blinking LEDs) on both ends:
   • Back of phone (near port)
   • Switch/router

If there are no blinking lights, the cable or port may be bad.

3. If You Use PC Pass‑Through

Some setups run your computer off the phone:

• The cable from PC port goes to your computer.
• This connection does NOT affect audio, but confirm it is also secure.

This is optional, but good to check in case the user reports network dropouts.

4. Check the Handset Cord

This is the curly cable between the phone and the handset.

1. Flip the phone to check the back.
2. Make sure the coiled cord is plugged into the port labeled “HANDSET” (usually has a phone icon).
3. The other end plugs into the bottom of the handset.
4. Reseat both ends by unplugging and plugging them back in.

Note: There are two similar ports for handset and headset—make sure it's in the correct one.

5. Check the Headset (If Used)

If user has a headset:

1. Unplug the headset.
2. Test the call with the normal handset.
3. If audio works with handset → the headset cable, base, or port may be the issue.

6. Restart the Phone

A cable may look connected but still cause issues until the phone reboots.

To restart:

• Unplug the network cable (LAN port), wait 10 seconds, plug it back in
  OR
• Unplug the power adapter, wait 10 seconds, plug it back in

Let the phone fully reboot (usually 30–60 seconds).

7. Test a Call

Once all cables are checked and the phone rebooted:

• Make a test call
• Listen for both outgoing and incoming audio

If you still get no audio, the issue is likely:

• Network/firewall / SIP ALG
• RTP ports
• Remote STUN phone settings
• Bad switch port
• ISP blocking RTP

I can help you troubleshoot the next steps.