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Network Requirements for Best Results with PbN Voice Phones

The following network settings and recommendations will help PbN Voice customers get the most out of their VoIP service.

Alyssa Elso avatar
Written by Alyssa Elso
Updated over 2 weeks ago

Network Settings

  • SIP-ALG needs to be disabled as well as all other mechanisms (H323) that alter SIP traffic, SIP headers, and SIP SDP information.

  • SIP bi-directional traffic needs to be allowed on UDP/TCP ports 5060–5061.

  • RTP bi-directional traffic needs to be allowed on UDP ports 16384–32768.

  • DNS queries need to be allowed from the phones to the Internet (UDP 53).

  • You will need to build an Outbound firewall rule for PbN Voice Traffic using our FQDN: ip-addr.pbnvoice.com

  • HTTPS (TCP Port 80) is required for PbN Voice phones to download their configuration files.

  • DHCP is required for any PbN Voice devices on-premise. If you need static IP addresses, we recommend using DHCP reservations. Otherwise, static IP addresses may be used if they are set up and maintained by the customer's IT staff.

  • VLANs are supported but must be set up and maintained by the customer's IT staff.

  • PbN Voice Phones must bypass all firewall advanced security features (IPS/Content Filtering/Etc.). These processes have been shown to cause issues with voice quality and connectivity.

  • An Ethernet Connection is required for each PbN Voice device. In the case where only one ethernet outlet is available, PbN Voice supported devices should have a built-in switch. A PbN Voice device must be plugged in first and all other devices must be plugged in through the PbN Voice device.

  • NAT is an essential part of most networks. PbN Voice devices do support NAT traversal over a single NAT connection. Networks with double NATs are not supported and will cause undesired results.

Internet Speed/Bandwidth

How Fast Should My Internet Connection Be for Best Results with PbN Voice Phone Systems?

A VoIP test tool from FitSmallBusiness.com provides valuable insights into how your current network will affect your VoIP call quality. Below, we include a free VoIP test tool to find out if your internet connection supports the recommended VoIP speed requirements.

  • Minimum speeds: 20 Mbps down / 10 Mbps up

  • Recommended speeds: 50+ Mbps down / 20+ Mbps up

  • Network latency to PbN Voice’s SBCs should be below 70 ms, with below 50 ms recommended.

Recommendations

For best call quality and smooth communication during calls, it’s highly recommended to put a QoS (Quality of Service) device—or the router configuration equivalent—in place to prioritize bandwidth for VoIP/Voice traffic on your network.

This helps prevent issues such as jitter, packet loss, poor call quality, and other related problems.

Additionally, the NAT TIMEOUT configuration parameters on your router should be increased from the default (usually 60 seconds) to 600 seconds (10–15 minutes).
This helps avoid abrupt call disconnections and ensures re-INVITE keep-alive is maintained throughout the duration of a call.

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