Telecom. vs. Telecomm.

Both refer to Telecommunications. But which one is correct? Dictionary.com has an entry for Telecom that gives a link to Telecommunications whereas oed.com [Oxford English Dictionary] says Telecomm is the abbreviation for Telecommunications. So, I guess telecom is American slang and telecomm is British slang!

Now an interesting question is which one is more commonly used in India? Indian Telecomm or Indian Telecom or Indian Telecommunications?

A Google with Telecom India or Indian Telecom gives more relevant sites like the Dept. of Telecommunications, India. Indian Telecommunications also gives some sites. But Telecomm India gives more links to exhibitions and events like Telecomm India 2007. What can be concluded is Telecom is more commonly or freely used by government authorities. Google suggests telecom if you search with telecomm. Hey, it wasn't a spelling mistake!

What do you think should be more commonly used?