so if the main number is also my sms number, and the main number is applied to an IVR, there is no way to have a user be able to send a text with 3cx unless that number is assigned to a particular user only?Firstly you need a DID of the that trunk to be pointed to your extension or pointed to a Queue or ring group you are a member off.
Then you will see the option in your mobile app. Just go to Chat click the "+" button and select the SMS option. iOS and Android are a bit different but the concept is the same for both.
Founded in 2005, when VoIP was an emerging technology, 3CX has gone on to establish itself as a global leader in business communications.