Updates

September 30, 2011

The London Stock Exchange

10 Paternoster SquareLondonEC4M 7LS

Dear Sir/Madam,

Sub: Updates

In furtherance to the announcement made by the Company on September 20, 2011, please be informed that the Company has concluded the transaction for sale of its activation business to Netcracker Technology Corporation, a leading telecom OSS player and part of the NEC group.

We request you to take the aforesaid notification on record.

Thanking you

Yours truly,

For Subex Limited

Ramanathan J

Vice President- Finance & Company Secretary