AT&T Synapse Installation Manual page 138

 To automatically update all devices to the latest software version:
Figure 148. Update Device
If the automatic process does not work, you can manually upgrade a Deskset, Gateway, or ATA individually. Automatic upgrades
may not work if your network's firewall prohibits connection to the AT&T servers, or if you do not have DNS services provided by
your ISP.
System Configuration
Synapse Installation Guide
137
.
Using
Internet download bandwidth of 1 Mbps and
an Internet router that can handle the same
number of total simultaneous connections as
the number of Synapse devices. Refer to your
router specification. Performing an update
without meeting the minimum requirement
may cause some or all devices not to update
correctly. See "System Upgrade" on
page 171.
The total time to update all the devices
varies. The update time depends on Internet
connection speed, the number of connections
to the server, and the number of devices in
the system. AT&T recommends conducting
system updates overnight to reduce the
impact on Deskset users.
requires a minimum