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Network requirements for audio and video

Microsoft Azure Communications Service (ACS)

For network and bandwidth requirements when using ACS as your call service provider, refer to the ACS documentation.


For network and bandwidth requirements when using LiveKit on-premises as your call service provider, refer to the LiveKit deployment documentation.

Vonage (formerly OpenTok)

Both the visitor page and the Agent Desk must be accessible via HTTPS.

The browser must access the audio and video chat services on the internet over specific ports.

The audio and video chat service uses the following domains:

  • *

  • *

The following HTTPS verification servers must be accessible for SSL certificate verification:




    The minimal requirement is that TCP port 443 is open. Some firewall and proxy rules only allow SSL traffic over port 443. You will need to make sure that non-web traffic can also pass over this port.

    Better experience

    In addition to the minimal requirements being met, UDP port 3478 should be open. The User Datagram Protocol (UDP) favours low latency over error-correction and is well-suited to audio and video communications.

    Port 3478 only accepts inbound traffic after sending an outbound request. The connection is bidirectional but is always initiated from your organization’s network, so it isn’t possible for an external entity to send malicious traffic in the opposite direction.

    Best experience

    For the best possible experience, UDP ports 1025—​65535 should be open.

You can test if a network meets the connectivity requirements by running the Vonage pre-call test.

Bandwidth requirements

  • Video: 300 kbps per stream (recommended lowest level)

  • Audio: 50 kbps per stream (recommended lowest level)

Network latency

You should take measures to keep network latency as low as possible.

  • For Unblu to work smoothly, a latency of under 200ms is recommended.

  • For the person controlling universal co-browsing or server-based document co-browsing, a latency of under 100ms is recommended.

If the network latency between Unblu and your users is greater than 500ms, features such as co-browsing or video calls become so slow that the user experience suffers significantly. With latency greater than 2000ms, the features are all but unusable.

Server communication with Vonage (formerly OpenTok)

The Unblu Collaboration Server must be able to communicate with which is a service located on the Internet. Thus, port 443 must be open for outbound traffic to that URL.