Grandstream 486 doesn't seem to like sending faxes. With PSTN I get
14,400 speed but with HT486 I get 2,400 speed and it keeps disconnecting.
Can other people report the HT486 as working to send faxes at 14,400 speed? Is it competent to do that? Do I need to change my service provider? They told me to set all codec to PCMU and I did that.