When I was truly in labor, I blocked out just about everything that was going on and have no clue what dh was saying to me, if anything.
Before I was truly in labor, I was carrying on a conversation.
In the brief period of moving from early labor and conversation to active labor and blocking, I think dh said stuff like "you're doing a good job". I think I appreciated hearing his voice. Actually, even when I blocked him out I think I just appreciated heearing that he was still there even though I wasn't listening to him. It was definitely a soft, calm, relaxing tone of voice.
During pushing I was ready to kill him when he joined the medwife with her cheerleading. They were both counting to ten, yelling at me to push with the contractions, push with my body, etc. Neither of them really listened when I said "I can't feel the contractions". Thankfully the doula didn't jump into the cheerleading. At that point, thankfully the nurse stunk and was mildly hostile because I wasn't being a good patient with her epidural - she just stuck to her corner and didn't say anything. I got even more upset with dh 6 months after dd was born when we were talking about the delivery. At the delivery he was agreeing with the medwife with things like "I can see her head", "just a little bit more", etc. Well, 6 months later he admitted that he couldn't see a thing and he was just providing encouragement based on what the medwife was saying. ARGH! I think that if he hadn't been cheerleading with the medwife, I might have had the sense and power to actually wait to have a pushing urge. Oh well.
Anyway, I think it really depends on the circumstances, but if you have some knowledge of what you want or don't want then it's important to make sure your dh understands. I didn't know what I would want during labor, but I did know I didn't want cheered pushing. I guess I didn't really voice that desire with dh before labor. I now know for next time. I think I need to convince him that he doesn't have to repeat everything the midwife says - one person offering encouragement might be sufficient.