Under the agreement, the vendor has gained full ownership of Avaya Contact Centre Express.
Tony Jayne, head of Agile Software told CRN in an interview, the company had an OEM agreement with Avaya for the past five years.
Jayne said the vendor saw an opportunity to purchase the intellectual rights to Agile Software because the mid-size market had become very competitive.
"The business, Agile Software NZ, has provided contact centre software technology for Avaya globally," he said.
"The software is used by Avaya currently under OEM license in 84 countries and has 3,000 customers.
"The technology was developed by Agile and is a part of Avaya's new Contact Centre mid-market expansion."
Jayne said he couldn't disclose the amount Avaya paid for the software, however the funds will be used to expand Agile's systems integration business in APAC and the West Coast of the US.
"With Avaya purchasing and integrating Agile Software into its contact centre, there's a limited number of integrators that can offer support for the product," he said.
"Before we sold the software rights to Avaya we provided training to its business customers and partners.
"The business will still continue without the software and the funds will allow us to expand further into the integration market, which might include an office in Australia."
Off the back of the purchase, Avaya has also launched its 'out of the box' Avaya Contact Centre Express product.
It provides mid-size businesses with features such as a unified desktop display, advanced multimedia tools, and integration to leading CRM software including Microsoft Dynamics CRM.
The product is powered by Avaya Aura Communication Manager, the company's voice and video telephony software delivering next-generation business communications.