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Technical Specifications

Need to know what's under the hood? Here's a detailed look at the technical capabilities of your phone system - from supported audio formats to network requirements. Whether you're setting up integrations or just curious about the system's capabilities, you'll find all the technical details here.

Audio Codecs​

The system supports multiple audio codecs to ensure optimal call quality and compatibility:

CodecSample Rate
OPUS48000/2
G7228000
PCMU8000
PCMA8000
G7298000
GSM8000
note

The system also supports telephone-event for DTMF transport, ensuring reliable touch-tone functionality during calls.

Network Configuration​

IP Ranges​

The system uses the following IP range for incoming and outgoing traffic:

46.19.208.0/21 (46.19.208.0 - 46.19.215.254)

RTP Ports​

Media traffic uses ports in the following range:

16384-32767
warning

When configuring firewalls or security settings, ensure these IP ranges and ports are properly allowed for optimal system performance.

Supported Protocols​

The system supports multiple protocols for flexible integration:

  • SIP over UDP (User Datagram Protocol)
  • SIP over TCP (Transmission Control Protocol)
  • SIP over TLS (Transport Layer Security)
    • Uses default port 5061 when TLS is enabled
    • Provides encrypted signaling for secure communications
  • SIP over WSS (WebSocket Secure) - Phone System App Only
    • Used exclusively by the phone system app for secure web-based communications
    • Establishes encrypted TLS connections for app communications
    • Enables secure real-time communication through web browsers and mobile apps
  • T.38 for fax transmission (to email)

Audio File Specifications​

Supported Upload Formats​

The following audio file formats can be uploaded to the Media Center:

  • .mp3
  • .wav
  • .flac
  • .ogg
info

Maximum file size for audio uploads is 14 MB

Call Recording Specifications​

Call recordings are generated with the following specifications:

  • File format: .mp3
  • Bit rate: 16 kbps
  • Sample rate: 8 kHZ
tip

Call recordings are approximately 7MB per hour. Consider this when configuring email delivery methods, as email servers may have file size limitations.

Time Zone Management​

The system implements the industry-standard IANA Time Zone database for precise time management:

  • Uses UTC offsets and daylight-saving rules from IANA
  • Default timezone is GMT (+0)
  • Supports all IANA timezone definitions
  • Automatically handles daylight saving transitions
tip

For more information about IANA timezones, visit:

System Requirements​

Mobile App​

The phone system app is available for:

  • iOS devices
  • Android devices
  • Windows computers
  • macOS computers

Web Interface​

The phone system panel (HTML 5 based) works best with:

  • Modern web browsers (Chrome, Firefox, Safari, Edge)
  • Minimum screen resolution: 900x600 pixels
  • JavaScript enabled
  • Cookies enabled

Security Features​

The system includes several security measures:

  • SIP Security

    • TLS support for encrypted signaling
    • SRTP support for encrypted media
    • IP-based authentication options
    • Strong password requirements
  • Web Interface

    • HTTPS encryption
    • Session-based authentication
    • Role-based access control
    • Activity logging
warning

Encrypted protocols (TLS, SRTP) are disabled by default. Contact support to enable these features for your account.

Integration Capabilities​

The system supports various integration methods:

  • Cloud Delivery Methods

    • AWS
    • Azure
    • MinIO
    • Google Drive
    • Dropbox
    • OneDrive
  • File Transfer

    • FTP
    • SFTP
    • Email attachments
  • External Systems

    • SIP trunking
    • External SIP URIs
    • PSTN routing (Phone number forwarding)
    • Interlink connections
tip

For optimal performance when integrating with external systems, ensure all required ports and protocols are properly configured in your network security settings.

Global Calling Capabilities​

The system provides advanced global calling features with localized rate structures:

Rate Categories​

  • Local Calling: Use FlyNumber to call within the same country at local rates
  • EU Calling: Special rates for calls within European Economic Area (EEA)
  • Standard International: Competitive rates for other international destinations

Call Forwarding Specifics​

  • EU rates apply for EU-originated calls forwarded to EU numbers
  • Standard rates apply for other international forwarding scenarios
  • Local rates not applicable to forwarded calls
Rate Structure Example

When using a UK FlyNumber to call UK numbers, you pay local UK rates. Note that US calls have consistent rates regardless of which FlyNumber you're using, making it an exception to the local rate structure.

Regional Exceptions

Some countries may have specific rate structures that differ from the standard local/EU/international categories. For current pricing details, see our phone system billing guide or check the phone system rates.