One way audio, words lost while on a call

One way audio is a common scenario involving one party within the call being unable to hear the other party in the call. In this situation, note down which party can hear - the caller or the receiver. If you are experiencing one way audio issues, firstly, follow these simple steps below:

1. Eliminate equipment issues by checking to see if the problem is caused by a faulty phone, handset earpiece or headset. 

2. Try rebooting the router to determine if the one way audio is caused by router issues. 

3. Contact your ISP or IT service provider if you have made any recent changes to your firewall. 

If the problem persists despite completing these basic troubleshooting steps, the issue may be caused by RTP (Real-Time Protocol) ports being blocked. The ports may be blocked due to the firewall configuration, NAT (Network Address Translation), incompatible codecs or problems with the routing network. A simple way to detect internal network issues is determining if other users are experiencing the same problems. From here, try connecting to another network or your mobile hotspot for example.