Advanced Settings of SIP Extension
This topic describes the advanced settings of a SIP extension.
Note: The SIP configurations require professional knowledge of SIP protocol. Incorrect
configurations may cause calling issues on the SIP extension.
Setting | Description |
---|---|
DTMF Mode | Set the mode for sending DTMF tones.
|
Transport | Set the transport protocol.
Note: If you change the transport protocol, you must re-register the
extension.
|
Qualify | Enable this option to send SIP OPTION packet to SIP device to check if the device is up. |
T.38 Support | Enable or disable T.38 fax for the extension. Note: Enabling T.38
will add performance cost. We recommend that you disable
T.38. |
NAT | Enable this option when the PBX uses a public IP address.
The feature is enabled by default. Note: If you manually set up Linkus
server, make sure the desired extension's NAT is enabled, or the
extension user can not access Linkus when he or she is out of local
network. |
SRTP | Enable SRTP for voice encryption. |