You support Skype for Business Server 2015 servers in your customer's network. The network includes two branches connected with an 8 megabits per second (Mbps) network circuit. The circuit has 1 Mbps of dedicated bandwidth for Skype for Business voice traffic. The network is required to handle 50 peer-to- peer (P2P) calls at a minimum using the Skype for Business 2015 client.
Users report that calls between the branches are being dropped, and voice quality is degraded.
Skype for Business audio codecs:

You need to calculate the minimum bandwidth required for the P2P call volume.
What is the minimum dedicated bandwidth that should you allocate?