Canvas, which has the BBC, ITV, Channel 4, Arqiva, BT and TalkTalk as its members, aims to upgrade the Freeview and Freesat platforms to support video on-demand and internet services.
Towards its scheduled launch in the first half of next year, the project has started the process of securing a range of manufacturers to become "device partners" for the venture.
Canvas said that the number of device partners taken on at this stage will "reflect the resources that are available within the Canvas programme and engineering teams".
Project Canvas director Richard Halton said: "Canvas is stepping up its engagement with industry as we get closer to releasing the final set of technical documents to the DTG this month, and launching a consumer product next year.
"Bringing on board further consumer equipment manufacturers will ensure people have the widest possible choice of devices and we remain focused on supporting the industry to stimulate a competitive market. We continue to work closely with the DTG to develop common standards for connected-TV."
Parties interested in becoming device partners must contact the project via email by the deadline of 5pm on August 25. All expressions of interest will be advanced to a process of identifying the best device manufactures to work with the venture.
The qualification criteria for becoming device partners are published under the 'Device Manufacturers' section in the 'Industry & Technology' part of the Project Canvas website.
Despite recently receiving clearance from the Office Of Fair Trading and the BBC Trust, Canvas is facing a fresh challenge from Virgin Media.
The cable operator has lodged a complaint with media regulator Ofcom expressing its concern that Canvas has moved away from its originally stated intention of creating an open standard for the delivering of IPTV services.
Virgin Media is also thought to be privately concerned that Canvas partners TalkTalk and BT could use the part-BBC licence fee funded project to launch their own services rather than making private investments.
The firm is further believed to be worried that the likes of ITV and Channel 4 could opt to make their video on-demand content exclusive to Canvas devices further down the line, at the expense of commercial rivals.
Ofcom is expected to communicate back on the matter within the next two months, with the watchdog having the potential option of referring the case to the Competition Commission.