Notes:
• SIP User ID and Authenticate ID should be the same.
• Always set Random Ports to “No” under Settings → General Settings.
Figure 4: Disable Use Random Port
HT813 Configuration
On the HT813 web GUI, access to “FXO Port”, then set the following:
• Primary SIP Server: Set to <IP_address_of_GXPphone>, which is in our case: 192.168.5.171
• SIP User ID: Any Number, in our case it will be 5555.
• Authenticate ID: Any Number, in our case it will be 5555.
• SIP Registration: No
• Outgoing Call without Registration: Yes
• Number of Rings: 1
• PSTN Ring Thru FXS: No
• Wait for Dial Tone: No
• Stage Method: 1