BSNL Calcutta recently introduced Voice SMS services for its Landline, WLL and GSM customers.

To access the service dial 1256 from your phone and wait for the IVR. Follow the instructions to record the message and input recipient numbers.

The service currently supports 45 seconds of voice in a single message

If the called party is busy 15 attempts will be made to deliver the message before the message is discarded.

Group messaging facility is also available which will help you to send the same voice message to a group of numbers. Its really useful when sending festival greetings and similar applications.