Yealink SIP VP-T49G User Manual page 203

The default ring time is 12 seconds.
(Optional.) Enter the no answer forward on code or off code respectively in the
5)
On Code or Off Code field.
You can also enable no answer forward for all accounts. Do the following:
Tap the All Lines soft key.
1)
The touch screen prompts "Copy to all lines?".
Tap OK to accept the change or Cancel to cancel.
2)
Tap the Save soft key to accept the change.
5.
If you activate call forward for the default account, the associated line icon will change to
(for SIP account) or
status bar.
(for Cloud account), and the icon
Basic Phone Features
will appear on the
203