MTNL Telephone Call Meter for home use

I am having MTNL 250 Combo Plan with 100 calls free per month.

I need to purchase a Telephone Call Meter for home use. I need to be sure I stay within the 100 monthly call limit and not overshoot.

The machine should have the basic minute counter, and calls made till date (on monthly / daily basis). Printout not required as no commercial use.

Thanks

I think now many of the open market landline handsets come with this feature

I checked online at site of Panasonic. No mention of Call meters. Search for call meters showed the instruments in use by PCO's.

Probably may have to make it on hunch basis. Will be buying wall mounted call-id phone.