Oracle will buy Acme Packet Inc., which makes equipment for telecommunications companies, for about $2.1 billion.

Acme’s gear is used by more than 1,900 service providers and enterprises around the world. Its technology will complement Oracle’s offerings for telecoms providers, said Citigroup analyst Walter Pritchard.

Oracle, a database software maker based in Redwood City, Calif., will pay $29.25 per share for Acme.