Fixed-mobile convergence, combined with voice over internet protocol (VoIP), will allow corporate customers to reduce their voice spend by over 30%, according to a new report.

Fixed-Mobile Convergence in the Enterprise Voice Market, published by telecoms, IT and media consultancy Analysys said mobile network operators in particular will have to work hard to slow the decline in enterprise voice revenues in the face of technology that can allow companies to bypass their more expensive services.

“Companies are spending over 80% of their call bill on mobile services, and that is causing them to turn to new technology looking for savings,” said the report’s author, Margaret Hopkins. “Wireless gateways, VoIP and WiFi offer them ways of cutting this bill that are independent of the network operators. Operators need to come up with innovative services to minimise the revenue leakage.”

The report also found corporate communications managers gain most by combining corporate mobile packages with VoIP on WiFi and using dual-mode phones and wireless gateways to reduce roaming bills and fixed-to-mobile charges.

As a result of this convergence fuelled trend, it also predicts dual-mode phones will account for 14% of handsets sold to enterprise customers in 2012 and that there will be 4 million in use in Europe by that date.