If you are a premium user, you can use the IM&P features with companies that are also using Altus. The only requirement is that both parties must have a premium license. To enable this, from UC One, add a new contact. Then under the IM address, type in the other users's phonenumber@umsimp.broadcloudpbx.net. So if you were linking to John Johnson and his number was 6158745555 you would make the contact, then select the IM address of 6158745555@umsimp.broadcloudpbx.net, place 6158745555 as the phone number, name the contact and then save.  Once you click save, the other party has the ability to accept or decline your request to see his/her status.