SIP IP Phone Models 480i, 480i CT, 9112i, 9133i Release Notes
General Information
Upgrade Notes
This section provides notes that customers should be aware of before upgrading to IP phone firmware release 1.4.1. Aastra Telecom recommends that customers read this section completely and thoroughly prior to the upgrade to avoid any known issues with the upgrade process.
•The recommended base IP Phone firmware to upgrade to this new firmware release is 1.2.2 or above.
•Users who previously adjusted the audio transmit and receive gains for the Aastra IP Phones should reset the values to "0" and
•Users upgrading from release 1.2.2 to 1.4.1 may experience
•Users who wish to downgrade from release 1.4.1 to 1.2 must downgrade to release 1.2.2 prior to downgrading to release 1.2, in order to restore file system structure. Failure to downgrade to version 1.2.2 first may result in configuration parameters being ignored.
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