RECOMMENDED SETTINGS TO AVOID PHANTOM/GHOST CALLS.
Grandstream Phones & Adapters
SIP Server: sip.aceweb.com
SIP User ID / Authentication ID: Provided by AceWeb Internet
Password: Provided by AceWeb Internet
NAT Traversal: STUN
STUN Server: stun.aceweb.com
FXS PORT SETTINGS
Unregister On Reboot: YES
Allow Incoming SIP Messages from SIP Proxy Only: NO
Check SIP User ID for incoming INVITE: YES
NAT Traversal: Keep-Alive