Technical Information

Supported Codecs

  • OPUS/48000/2

  • G722/8000

  • PCMU/8000

  • PCMA/8000

  • G729/8000

  • GSM/8000

  • telephone-event (for DTMF transport)

IP addresses and RTP ports

  • 46.19.208.0/21 (46.19.208.0 - 46.19.215.254) - for incoming and outgoing traffic. (Please note that incoming traffic can be accepted only to phone.systems™ unique domain xxxxxxxxxxxx.in.phone.systems)

  • RTP port range - 16384-32767

DTMF Transport Methods

  • RFC2833

Protocols

  • SIP over UDP (User Datagram Protocol)

  • SIP over TCP (Transmission Control Protocol)

  • t.38 for fax transmission (to email)

  • SIP over TLS (Transport Layer Security)

  • SIP over WSS (WebSocket Secure)

Audio file formats

Supported audio files for uploading to Audio Files (file size is limited to 14 MB)

  • .mp3

  • .wav

  • .flac

  • .ogg

Call Recording File Specifications

  • File format .mp3

  • Bit rate 16 kbps

  • Sample rate 8 kHZ

Time Zone

phone.systems™ is using UTC offsets and daylight-saving rules issued by IANA