Mumbai, June 30: Several call centre companies, including those set up by venture funds or business houses, are looking for an exit as competition in the segment heats up with the entry of several multinationals. Promoters/venture investors in First Ring, I-Seva, Vision Heathsource, Zentac and Tracmail are learnt to have expressed interest in offloading part or whole of their holding to strategic investors. Epicenter Technologies, owned by the Kalyani group, was said to be considering the same, but has now decided to form a joint venture with a large US company that will help it ramp up business, according to investment banking sources.