Anyone of you know how to setup a good quality of voice for Quintum Tenor DX. I have problem on how to eliminate hissy sounds. Is there any possible solutions?
Doublecheck that you have set the E1 to A-law and not to U-law and that you have the latest firmware (in the earlier releases it keeps using U-law even if set to A-law).
Otherwise, put the blame on your Internet Provider.