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.
46.19.210.69 - for sending deliveries.
RTP port range - 16384-32767
DTMF Transport Methods
DTMF signaling is supported as follows:
Telephone-event: RFC2833
SIP INFO: draft-kaplan-dispatch-info-dtmf-package-00
application/dtmf-relay
application/dtmf
Note
By default, RFC 2833 is enabled.
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
.m4a
.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
IANA Time Zone database - https://www.iana.org/time-zones (https://en.wikipedia.org/wiki/Tz_database )
Default timezone is GMT (+0)