People say they can't understand me that I'm breaking up

Question

Whenever I make a call or answer a call with Zoiper Biz, the other person can hear me only half the time.  I've called myself to test it and it seems like it's having a hard time keeping up with the speed I'm talking at.  Zoiper has worked just fine for me for about a year now.  First time I've had this problem.

Thanks!

Answer 1

https://duckduckgo.com/?q=sip+audio+troubleshooting 

1

Over which flavor of network connection?   (home wifi with questionable quality router, mobile provider LTE, mobile provider 3G, 'free' wifi hotspot, etc)

2

enabled or not:  STUN, ICE, VIA

3

software upgrades on device?

4

any 'security' software running?