Hello, We upgraded v15 SP 4 to SP5 and things are not working well with our Polycom VVX 500 phones now. I need to revert back to SP 4 but I do not see anyplace where 3CX posts the older versions. Can you please point me in the right direction? I know 3CX support is limited for Polycom VVX 500 phones, BUT things were working fine on SP4 and I have hundreds of phones. Now on SP5, my phones randomly reboot, get hung up, lag, and are generally not working as well. I need to revert to SP4. Please advise!