ATL Telecom IP250 - Manual (Page 29)

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Enable Global Number support (E.164): add prefix “+” for dialed numbers in sip
invitation.
Send NOTIFY for REFER request: send out NOTIFY request to transferer for
unattended and attended call transfer.
Send Message Waiting Indicator (MWI) SUBSCRIBE command: send SUBCRIBE
after registered to server to check if there are any messages to be read.
Send INVITE with Timer header: encode Timer header in all INVITE requests for
ringing timeout.
Enable SIP session timer: If you wish for the SIP stack to implement a session timer
according to “draft-sipsession-timer”, select the option.
SIP T1 Timer, SIP T2 Timer, and SIP T4 Timer: please refer to RFC3261.
Press “Save SIP Extension Settings” to save the new values.
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7 CONFIGURATION
7.1 Backup
Backup configuration values of system settings to a file from the device:
Click “Configuration” item on the top menu.
Click “Backup” item on the left menu.
Press Backup Configure File button to save configuration file.