Oracle has agreed to buy HotSip, a vendor of communications software based in Stockholm. The company sees the company as a means of strengthening its hand in telecommunications infrastructure software

HotSip sells the HotSip M2CE, a carrier-grade application server for SIP and J2EE (Java 2, Enterprise Edition). SIP is emerging as a common protocol to link many forms of communication on IP networks. The M2CE can be used as a platform for HotSip IP telephony, presence, messaging and conferencing applications. HotSip also offers a service creation environment for customizing existing applications and adding new ones to the M2CE.

Oracle recently closed its approximately US$5.85 billion acquisition of Siebel Systems and on Tuesday announced its purchase of open-source database vendor SleepyCat Software.

Terms of the deal were not disclosed.