Figure 10: Configure Remote Extension Via Stun; Figure 11: Nat Traversal Set To Stun - Grandstream Networks 3CX Configuration Manual

Figure 10: Configure Remote extension via STUN

6. Once saved, navigate to Network Settings and set NAT Traversal to "STUN".

Figure 11: NAT Traversal set to STUN

7. Press Save button and navigate to Settings  General Settings. In STUN Server field, set a valid
STUN server ("stun.3cx.com:3478" for example).
P a g e | 14
Configuring Grandstream Devices with 3CX Phone System