Combined download should be used where phones may be running pre-4.0 BootROM.
Split download file is recommended, but requires that all phones are running BootROM 4.0 or newer.
Before deploying UCS 5.2.0 or Later to VVX 1500 – Please carefully go through the instructions in Technical Bulletin 695
NOTICE: The issues that required UCS 5.4.2 to be withdrawn from the Polycom Support web site have now been resolved and the new build is now available for download. Polycom recommends that any customers who have already downloaded UCS 5.4.2 should download UCS 5.4.2 Rev D and use that release going forward. If you have any questions, please contact your Polycom Global Support representative.
UCS 5.4.0 WARNING:
Due to a serious DTMF related issue discovered just after posting UCS 188.8.131.5236, Polycom has made the decision to REMOVE this version of UC Software and replace it with UCS 184.108.40.20641. As a result, UCS 220.127.116.1136 is NO LONGER SUPPORTED. If you have downloaded UCS 18.104.22.16836, please replace it with UCS 22.214.171.12441 as soon as possible.