Could not register with the SIP server?

DNS – IP phones may be configured to find their SIP servers using a DNS address rather than an IP address. If this is the case, and the local DNS service fails, then phones will be unable to find the SIP server and will fail to register.

How do I connect my NEC phone?

Connecting to PCPro

  1. Connect your computer and the phone system to the same network.
  2. Power on the phone system.
  3. Download the NEC SL2100 PCPro Software or Download the NEC SL1100 PCPro Software and install it on your computer.
  4. Open PCPro and click the connect button.
  5. Click the Connect button.

Why is my VoIP not working?

This is usually caused by bad network conditions or internet congestion. VoIP connections are dependent upon data packet transmission. Therefore, even a small amount of packet loss can result in VoIP communication issues. To find out if you’re experiencing packet loss you’ll need to run a ping test.

How do you reset VoIP?

Navigate to Phone > Upgrade and select “Reset to Factory”. In the phone menu, select Option 14 to factory reset the phone, then hit OK to confirm the reset. Press and hold 4, 6, 8, and *. Enter the admin password to proceed with the factory reset.

What does SIP server not found mean?

SIP Server Not Found is an indication that the phone cannot contact the IP Address set as the SIP Server or cannot contact that SIP Server on the Server’s Registration Port (Default: 5080).

How do I find the IP address of my NEC phone?

Locating the System IP & VoIPDB Address on the NEC SL2100 or SL1100

  1. Go to any phone press the Menu soft key.
  2. Dial 96 on the phone’s key pad.
  3. Press the Select soft key.
  4. The System IP Address (System), and VoIP Daughterboard IP Address (VoIPDB) will display for 5 seconds.

How do I change the IP address on my NEC phone?

Changing the VoIP IP Address

  1. Go to Program 10-12: CPU Network Setup.
  2. Set the value of 10-12-09: VOIP IP Address to your Static IP Address for VoIP Connectivity.
  3. Set the value of 10-12-10: VOIP Subnet Mask to your Subnet Mask.
  4. Set the value of 10-12-03: Default Gateway to your Default Gateway.
  5. Apply and upload these changes.

Why is my VoIP phone not working?

Either the router is malfunctioning, or you have the wrong router for cloud telephony. When using VoIP, you’ll need a router that prioritizes calls through the internet. This feature is known as Quality of Service, or QoS for short. This prioritizes VoIP calls ahead of less-critical network traffic.

Why is my mobile VoIP not working?

Reboot your device and check if you are registered. If you still cannot make VoIP feature work with your mobile phone, this is due to your router’s firewall (also known as NAT) blocking certain operations of your mobile phone VoIP feature.

How do I connect my VoIP phone to my router?


  1. Power off the modem and router.
  2. Connect the VoIP phone handset to the base station.
  3. Connect an Ethernet cable to the desktop phone.
  4. Connect the Ethernet cable to the router or modem.
  5. Power up the modem and router.
  6. Connect the AC adapter to the VoIP phone.
  7. Check an outbound call.