COD4 Quick Launcher v1.10 [Call of Duty 4: Modern Warfare] [Modding Tools]
[MW] So this guy on CoD4 was constantly spamming in the chat so I did this, don't know if he's a bot or a 10 year old who just discovered quick chat : CallOfDuty
Call of Duty® 4: Modern Warfare® on Steam
How To Fix COD Black Ops Cold War Voice Chat Issues
Try checking your own NAT and see if changing it can help fix your voice-chat-not-working issue.