Range: 0 – 3600, default is 300
Uplink Bandwidth The maximum uplink bandwidth permitted by the device. This function is disabled by
default. The total bandwidth can be set as: 128K, 256K, 512K, 1M, 4M or 10M.
For example if 64 is configured, there will be at least 64kbps reserved for VoIP. The
primary function of this setting is to reserve bandwidth for VoIP.
Downlink Bandwidth The maximum downlink bandwidth permitted by the device. This function is disabled
by default. The total bandwidth can be set as: 128K, 256K, 512K, 1M, 4M or 10M.
For example if 128 is configured, there will be at least 128kbps reserved for VoIP. The
primary function of this setting is to reserve bandwidth for VoIP.
Enable UPnP When set to “Yes”, the HT503 acts as an UPnP gateway for your UPnP enabled
applications. UPnP = “Universal Plug and Play”
Reply to ICMP on WAN
Port When set to “Yes”, the HT503 responds to the PING command from other computers,
but is also made vulnerable to DOS attacks. Default is No.
WAN Side HTTP/Telnet
Access When set to “Yes”, the user can access the web configuration pages through the WAN
port, instead of through the PC port. Warning: this configuration is less secure than the
default option. Default is No.
Cloned WAN MAC
Address: This allows the user to change/set a specific MAC address on the WAN interface.
Note: Set in Hex format
LAN Subnet Mask
Sets the LAN subnet mask. Default value is 255.255.255.0
LAN DHCP Base IP:
Base IP for the LAN port, which functions as default gateway for its LAN. Default value
is 192.168.2.1
DHCP IP Lease Time The length of time the IP address is assigned to the LAN clients. Value is set in units of
hours. Default value is 120 hrs (5 days).
DMZ IP:
This function forwards all WAN IP traffic to a specific IP address if no matching port is
used by HT503 or in the defined port forwarding.
Port Forwarding: Allows users to forward a matching (TCP/UDP) port to a specific LAN IP address with a
specific (TCP/UDP) port.
PSTN access code The code to access the PSTN line (Maximum 5 digits). Default is “*00”.
PIN for PSTN calls PIN code to bridge from VoIP to PSTN (Maximum 8 digits, No Default)
PIN for VoIP calls PIN code to bridge from PSTN to VoIP (Maximum 8 digits, No Default)
Route Call to PSTN If the dialed digits match one of the specified prefix here, outbound calls will be initiated
from PSTN line. This field is especially useful for emergency calls.
Unconditional Call
Forward to PSTN Calls are unconditionally forwarded to the specified PSTN phone number for all
incoming VoIP calls on FXO port.
Unconditional Call
Forward to VoIP Calls are unconditionally forwarded to the specified VoIP phone number for all
incoming PSTN calls.
Grandstream Networks, Inc. HT503 User Manual Page 21 of 35
Firmware 1.0.0.6 Last Updated: 6/2007