There are several reasons. Sometimes, people just generally think that we are telemarketers as soon as we introduce the call. It may be because of how the management "scripts" our introduction or how we sound when we introduce the call, but most people just hate receiving calls from telemarketers, so thinking that we are one of em, they'd rather hang up. A second possible reason would be the alarming number of people using the relay service for scams. Unfortunately a lot of people use the service to rip off other people. Some businesses are just so traumatized that they no longer want to answer any relay call, not considering that the caller may be legitimate. Yeah, some also feel uncomfortable of having a third person listen in on their calls.. especially if they're talking about a sensitive subject or if they're handling private issues such as bank transactions or medical concerns. Other people are just too impatient to take relay calls. They don't like the idea of having to wait for the deaf party to finish typing or to slow down so that the relay operator can type what they're saying.