Grandstream Networks HT818 - UPGRADING AND PROVISIONING; Firmware Upgrade procedure

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HT81x User Guide
DTMF Methods
The HT81X support the following DTMF mode:
• 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 HT81X support following voice codecs. On Profile pages, choose the order of your favorite codecs:
• PCMU/A (or G711µ/a)
• G729 A/B
• G723.1
• G726
• iLBC
• OPUS