Advanced Settings of SIP Extension
This topic describes the advanced settings of a SIP extension for IZT Cloud Voice.
Note: The SIP configurations require professional knowledge of SIP protocol. Incorrect configurations may cause calling issues on the SIP extension.
Settings Overview
DTMF Mode
Sets the mode for sending DTMF tones:
RFC2833: DTMF will be sent in the RTP stream as RFC2833 packets.
SIP INFO: DTMF will be sent using SIP INFO messages.
None: The device supports RFC2833 and RFC4733; otherwise, the PBX will choose to send DTMF through the SIP extension.
Transport
Specify the transport protocol:
- UDP
- TCP
- TLS
If you change the transport protocol, you must re-register the device.
Quality
Enable this option to use the SIP OPTION packet to check if the device is up. Disable to not use this option.
T38 Support
Enable or disable T38 for fax performance (note that you disable T38).
SRTP
Enable SRTP for voice encryption.