Hardware changes made to the IP Phone 1120E and IP Phone 1140E product design have recently been introduced into the factories. One of the changes was within the power circuitry to include additional power efficiencies for both IP Phone models. Both IP Phone 1120E and IP Phone 1140E models continue to support IEEE standard 802.3af for power over Ethernet as Class 3 devices. The new hardware requires a minimum IP Phone Firmware of UNIStim Rls 3.1 or SIP Firmware Rls 2.1. The product models ship from the factory with either the UNIStim or SIP Firmware minimum release levels installed, and the units also contain a mechanism to avoid a firmware downgrade to below the required minimum version.
Required actions by customer:
Upgrade firmware loaded on Signaling Servers to C6J (UNIstim 3.1) or later.
If the firmware is not upgraded on the Signaling Server to at least UNIstim 3.1, when the new IP 1120E and IP 1140E phones are attached to the CS1000 PBX an attempt will be made to “downgrade” them to whatever UNIstim release is currently installed. This will fail repeatedly with a spurious error message (unless a patch is installed on the PBX to correctly interpret the downgrade denial response.) Since these phones cannot be “downgraded” they will be denied service until the UNIstim firmware is upgraded at that site.
CS1000 Release 5.0 and later do not require the patch to properly interpret the downgrade denial.
IP 1120E & IP 1140E New Minimum Firmware Requirement [Bulletin] (19.3 KiB)
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