T22P firmware versions

[OXE]

I am interested to understand T22P firmware versions logic. For example: 7.73.193.50.ROM
Digit 7 in first portion means firmware for T22, second portion 73 means version number.
But what means third and fourth portions, 193 and 50 ?
What difference between 7.73.0.50 and 7.73.193.50?
Is it just subversion or specialized firmware for specific SIP server?

[Klaus_Yealink]

Hi

193 means it is broadsoft version,

0 means it is a common vesion,not customization version!

the fourth portion means the little version number,such as the next firmware maybe name 7.73.0.60.

7.73.0.50 is common firmware,7.73.193.50 just use for broadsoft platform.

klaus

[OXE]

How much different adaptations exists?
I mean apart 0 (common), 193 (broadsoft),...
I see also 1 (7.70.1.20, 7.71.1.1).