Gambia +220 will be billed 1/1 (per second) starting February 23rd,2018.
It’s been a few years where Termination Billing Increment for Voice traffic to Gambia was set to 60/60 by the telecom regulations, it looks like this has been changed and starting from February 23rd,2018 the new Billing Increment will be back to 1/1 for Gambia.