
Grandstream Networks, Inc. GXW-400x User Manual Page 12 of 31
Firmware 1.0.0.17 Last Updated: 12/2006
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.
P
REFERRED VOCODER (CODEC)
The GXW–400x supports a broad range of voice codecs. Under Profile web pages, choose your
preferred order of different codecs:
• PCMU (or G711µ)
• PCMA (or G711a)
• G729 A/B/E
• G723
• G726-32
• iLBC
• G728
• GSM
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