Grandstream Networks GXW400x - Manual (Page 20)

Grandstream Networks, Inc. GXW-400x User Manual Page 20 of 39
Firmware 1.0.0.39 Last Updated: 5/2007
Enter a STUN Server IP (or FQDN) 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, so set this parameter to Yes or No, whichever works.
Generally if you have multiple IP 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 GXW–400x 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