Wired connections generally deliver the best quality experience. Your network should use cabling that meets the specification for your network speed.
- Keep watch on the error counters on the equipment as this is a good indicator of cabling or port issues
- Cabling to match the network speed of the equipment
Mobility is a major component of modern business communications and a key feature of Dialpad. To optimize your WiFi networks for HD Calling (VoIP) services, we recommend:
- Legacy Wireless Network Specifications
- Planning (flesh out)
- WMM (Wifi Multi-Media)
- Ranging from high - low priority, these categories are:
- Best Effort
- Unique SSID for Enterprise users
- Utilize 5GHz when possible
- Utilize "band steering" when possible
- Use latest bit rates and network specifications for WiFi access
- Enable WMM for better QoS
- Measure the quality of your wireless frequency and WiFi scanners
To ensure the best possible voice quality, we recommend using either any high-speed DSL, Broadband, or Fiber-optic connection. With a minimum dedicated upload and download bandwidth of 100 kilobits/sec for each voice line, you plan to run.
Routers, Switches, and Firewalls
Dialpad does not require a specific brand or mode Router, Switch or Firewall, to ensure the highest possible quality of service, the Network hardware should have the following capabilities:
- Bandwidth Limiting
We also recommend checking that these following features are turned off. Please contact our support team if you are unable to turn off these features:
- Deep Packet Inspection (DPI)
- Stateful Packet Inspection (SPI)
A virtual LAN (VLAN) can be used to put your hard-wired phone devices into separate networks, and to manage security and routing policies separately. If you plan to deploy IP phones, they can be placed in a "voice VLAN".
A voice VLAN is not a network requirement for Dialpad service but best practices for setting security, DHCP, routing, QoS/CoS a voice VLAN may be used.
Enabling QoS will depend on your router and its capabilities. The following are general guidelines based on protocol and port, along with a basic priority level (highest, high, low, etc.).
Specific rules will better define the traffic rules, eliminating erroneously flagged packets as being a high priority.
Routers may allow QoS to be defined based either on application (RTP/SIP), or allow QoS to be defined on application and port (RTP over UDP), or allow on destination port, or any combination of Application, Source/Destination port. Dialpad’s Voice traffic is flagged with DSCP markings:
- DSCP 46 = RTP Traffic
- DSCP 26 = SIP Traffic
Routing to an FQDN or Fully Qualified Domain Name, allows modern Cloud Networks flexibility for Routing, Security, System Maintenance and remote Device management.
Dialpad uses FQDNs for:
- Exchange SIP to set up call
- Manage Device Firmware
- Manage Device Configurations
- Remote Device management
Dialpad recommendation as a best practice to whitelist traffic to/from each of the following FQDN:
Ports and Protocols
Port and Protocols used by Dialpad phones and applications residing in private network are listed below. Outbound port configurations are needed on the Firewall to allow traffic to the Destination Ports listed in the right-hand side column of the tables. Stateful Firewall is recommended for Dialpad deployments. For Stateful Firewall, inbound port configurations are not needed as they are automatically opened as a reply to the outbound traffic.