Deal will help Avaya support operators, enterprises migrating to all-IP networks In a move to beef up its Internet networking expertise, communications vendor Avaya has agreed to acquire Ubiquity Software, a developer of software applications using SIP (Session Initiation Protocol) technology.The deal, worth £74.3 million ($144 million ), will help Avaya provide support to network operators and enterprises migrating to all-IP (Internet Protocol) networks, the company said Friday.Avaya designs, builds and manages communications networks for more than 1 million companies worldwide. Ubiquity develops SIP-based communications software to service providers, ISVs (independent software vendors) and OEMs (original equipment manufacturers) around the world.SIP technology, for instance, lets traditional or mobile phones work together more readily with applications such as e-mail and instant messaging. Technology Industry