Ofcom needs to take further action to ensure BT makes its underground ducts and telegraph poles accessible to wholesale users, it has been claimed.
According to the Communications Management Association (CMA), the media regulator's "apparent acquiescence towards BT's reluctance to share its ducts and poles" is a source of frustration for members.
The CMA said the continual delays to the 4G auction and the self-serving attitude of the major mobile network operators is also a source of "irritation".
BT is due to publish a pricing structure for its national fibre network this month, but rival broadband providers have raised concerns that they may be charged too much.
Earlier this month, David Goldie, Commercial Director at the TalkTalk Group, warned that BT is looking to re-establish a telecoms monopoly through its ongoing fibre broadband rollout.
However, Olivia Garfield, Chief Executive of BT Openreach, responded by saying BT has provided reciprocal wholesale access to its fibre network "from the outset".
"This allows other operators to piggyback off our investment, while encouraging competition and the take-up of fibre services to thrive," she stated.