SMH10 - Three-way Conference Phone Call Sena November 17, 2016 01:45 Follow Have more questions? Submit a request 2 Comments Date Votes 0 Jon Mutiger January 06, 2014 18:39 Can you use this to connect more than 3? 0 Sena - D January 06, 2014 23:30 Hi Jon, If you include a phone call this is the limit. If no phone call is included, you can have 4 SMH10 users in an intercom. Dean Article is closed for comments.