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Dtmf Methods; Preferred Vocoder (Codec) - Grandstream Networks DUAL FXS PORT HT502 User Manual

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Set this to Yes when gateway is behind firewall on a private network.

DTMF METHODS

DTMF Settings are in FXS portX pages.
 DTMF in-audio
 DTMF via RTP (RFC2833)
 DTMF via SIP INFO
Set priority of DTMF methods according to your preference. This setting should be based on your server
DTMF setting.

PREFERRED VOCODER (CODEC)

The HT502 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
 AAL2 (all G.726)
FIRMWARE VERSION 1.0.6.8
HT502 USER MANUAL
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