What can I do about poor voice quality when using softphone?
Remove the following codecs from the list of available codecs in the SIP gateway on the XPhone Connect administration interface (Telephony > Gateways > SIP) or alternatively put them in the back of the list
Poor voice quality during conferences in connection with Softphone may occur due to a set bypass media flag. Remove this flag in the SIP gateway on the XPhone Connect administration interface (Telephony > Gateways > SIP).
Set the following registry keys on your client computer:
Name: Do not use NLA
Also check the steps from the following article:
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