
Similar to other PC-based messaging applications, WebTXT allows for messaging to mobiles and the sending of group messages.
However it also enables messaging using a spreadsheet to create an address book with categories and check the history of SMS messages sent and received by date.
Primus has partnered with messaging solutions provider, Qmani, to deliver the service.
Each message is charged at 18 cents apiece and is billed to a user's iPrimus internet account.
Primus Telecom Consumer Division general manager, Bryan Yianakis, said PC-based SMSing had the potential to be a more effective way to communicate than email or voice mail.
"It avoids telephone tag, allowing you to say exactly what you want through SMS, and to receive an SMS reply to your inbox and email,” he said in a statement.
"For many people, sending SMS from a mobile phone can be a tedious process. If you can use email, you can use Web TXT," Mr Yianakis said.
Primus Telecom is Australia's fourth largest fixed-line telecommunications carrier.