"Off-hook" dialing?

[IanPilcher]

I am trying to find a DECT SIP phone system to replace an old analog DECT phone, which is connected to a PAP2T ATA.

These are my home phones, so I've done everything possible to make them act like traditional analog phones. In particular, I use "off-hook" dialing. The ATA is configured to connect to Asterisk as soon as a phone goes off hook, and I use the DISA application to implement a decision tree. This allows my dialplan to immediately recognize international numbers of various lengths, without waiting for a timeout or # key.

Is it possible to configure a W52P (or W56P) to do this? I see the account.X.auto_dial_enable and account.X.auto_dial_num configuration file parameters, but it isn't exactly clear what this does. (My desired use case would be for the phone to auto-dial an extension when the off-hook button is pressed with no digits entered.)