No subject

of OAM protocols, some of the are standardized (mostly
by ITU). However, many vendors choose to use their own
extensions/workarounds/incompatibilities which leads
to delivery of a vendor-specific network management
software and devices as well as related integration services.

As having network management protocols in place is a must
of the carriers, this leads to deployment of those 
network management tools.

I have worked on a pretty large telecommunications network
that had a separate network operations centers for 
different vendors' equipment (like, for Siemens equipment,
Alcatel equipment, AT&T/Lucent, etc.). So having multitude
of management protocols is not unusual in the traditional
telecommunicatons.

That's not quite the way the Internet protocols operate.

//Marcin