This app was mentioned in 4 comments, with an average of 1.75 upvotes
Thanks. That app works and so does the Watch Phone app
But I also use and app called Voice Choice 2.0 that allows making some calls through Google Voice and others through Cell number. And none of these Android wear call control apps work with that because of how it aborts Google Voice calls.
Emailed Watch Phone dev about it since he pushed an update just yesterday.
There is a app for that, Watch Phone. I really like the design of it, but lately I've had some trouble getting some of the features to work on my SmartWatch 3 and LG g3. The developer has been very responsive so I am hopeful that it will be fixed, it is definitely worth checking out.
https://play.google.com/store/apps/details?id=com.psksoft.watchphone
Found this app for call controls (mute, speaker phone, hangup), works great and the dev was super responsive and fixed something that didn't work quickly.
https://play.google.com/store/apps/details?id=com.psksoft.watchphone