3Com 3C10402B Administrator's Manual page 241

At this point the system performs these steps:
Backs up the database.
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Reboots automatically after the backup is complete.
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Enables Standard IP.
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The system running in SIP mode must use Standard IP as its network
protocol. The system disables IP On-The-Fly and Ethernet and makes
them unavailable. All telephones operate at Layer 3.
Enables the Third-Party Messaging option in System-Wide Settings as
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part of the reboot process.
The Third Party Messaging option does not require a license in SIP
mode. The NBX Messaging option is disabled and unavailable in SIP
mode.
Disabling SIP Mode
To convert a SIP mode system to a 3Com call control mode system:
1 Log in to the NBX NetSet utility using the administrator login ID and
password.
2 Click System-Wide Settings > Enable Features System-Wide.
3 Clear the Enable SIP check box, and then click Apply.
The system queries if you want to restore the database from a
previously-stored backup. If you do not select a previously-stored backup,
the system uses the default backup database when it reboots.
Caution: When you enabled SIP mode, the system created a backup
database for you. If you disable SIP mode, you can use that same backup
database to restore the system to its pre-SIP mode state. However, if you
use the default backup database, the system will not be restored to the
state it was in before you converted the system to SIP mode because
non-RTP device data cannot be restored by default.
4 Click OK.
You have chosen to run in 3Com call control mode. At this point, the
system:
Backs up the database.
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Reboots automatically after the backup is complete.
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Enables Ethernet as a part of the reboot process. (You can change this
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setting if you wish.)
Enabling and Configuring SIP Mode 241