For newer Axis cameras go to System=>Plain Config
Scroll down to Properties option:
And look for System section and "Architecture" line:
Select the push module that has a name that ends on the symbols found above.
A list of all available push modules can be found:
Axis Camera Push Modules in your knowledge base
For older cameras that still have the old version of web interface go to System Options => Advanced => Plain Config:
From the dropdown menu select Properties option:
Scroll down to Properties System and look for "Architecture" line there:
Select the push module that has a name that ends on the symbols found above.