The Siemens OpenStage Power Supply Unit is a PSU compatible with all Siemens OpenStage telephones.
The OpenStage T range are digital telephones that are sold with the PSU. This PSU would therefore only be required if you damaged or lost the one supplied with your phone.
The Siemens OpenStage HFA & SIP phones are PoE and therefore are sold without power supplies. If you do not have PoE on your network, you will need to purchase This PSU as well as the telephones. If you have PoE, you do not need the PSU.
Although the Siemens OpenStage 60 and 80 (HFA & SIP) models are PoE, they require a lot of power, so for best operation, we would recommend you purchase a PSU.
If you are using planning to increase the power of your telepone by adding a Key Module (AOM), you will also need this PSU.