Mtnl Delhi has launched a new combo plan with 8mbps speed at a new low point of Rs.399+GST for it’s adsl broadband service.
And even at such a low point local calling is unlimited to any network.

Freedom ULD 399 Combo Plan
Rental Rs.399+ GST
Download speed 25GB till 8mpbs after that 1mbps
Upload speed 512kbps flat
Unlimited local calling to any network
Unlimited calling to Mtnl Mumbai network
Re.1 per minute to any other std network.

Offer valid till 10th Jan 2018.

Well if you can get around 8mbps speed in this plan then nothing can beat this plan specially for business users who need calling & landline phone for day to day usage as unlimited means unlimited in Mtnl. No hard and soft limit on calling.