WARNING: you SHOULD NOT use this plugin if your phones are using BootROM version 2.5.x or ealier.
WARNING: you SHOULD NOT use this plugin if your phones are not using the SIP Application 3.1.6.0017 AND you don't plan on upgrading your phone to this version.
This plugin is targeting Polycom phones in version 3.1.6.0017, i.e. Polycom phones using the SIP Application 3.1.6.0017.
SIP Application 3.1.6.0017 necessitate the following BootROM version:
This is why this plugin is also targeting Polycom phones using BootROM in version 4.1.4.0122, which is the latest BootROM that all the targeted phones support.
The problem is, it's not possible to upgrade the BootROM from version 2.5.x or earlier to version 4.1.4.0122.
It's important to only use phones that are using the SIP Application 3.1.6.0017 since the sip.cfg and phone1.cfg configuration file are strongly tied to this particular version of the SIP application. That's why you should either download the firmware files of this plugin or you should make sure your phones are using SIP Application 3.1.6.0017, or you might have incorrect behavior.