Grandstream Networks, Inc. GXW4024 User Manual Page 19 of 35
Firmware 1.0.1.8 Last Updated: 5/2008
I
MPORTANT SETTINGS
The end-user must configure the following settings according to the local environment.
NOTE: Most settings on the web configuration pages are set to the default values
.
NAT Settings
If you plan to keep the gateway within a private network behind a firewall, we recommend using a STUN
Server. The following three (3) settings are useful in the STUN Server scenario:
1. STUN Server (under Advanced Settings webpage)
Enter a STUN Server URI that you may have, or look up a free public STUN Server on the internet
and enter it on this field. If using public IP, keep this field blank.
2. Use Random Ports (under Advanced Settings webpage)
It really depends on your network settings whether to set this parameter to Yes or No. Generally if
you have multiple VoIP devices under the same network, it should be set to Yes. If using a Public IP
address, set this parameter to No
.
3. NAT Traversal (under the Profile web pages)
Set this to Yes
when gateway is behind firewall on a private network.
DTMF Methods
DTMF Settings are in Profile pages.
• DTMF in-audio
• DTMF via RTP (RFC2833)
• DTMF via SIP INFO
Enable one or more DTMF methods based on your PBX system.
Preferred VOCODER (Codec)
The GXW4024 supports a broad range of voice codecs. Under Profile web pages, choose your preferred
order of different codecs:
• PCMU/A (or G711µ/a)
• G729 A/B/E
• G723
• G726 (16/24/32/40)
• iLBC
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