Brand an Inbox with a phone number instead of soley branding with an email

Please provide the ability to Brand an Inbox with a phone number instead of soley branding with an email. My company needs this for reporting purposes. Currently the messenger app seems to be assigning the brand on phone calls and we have multiple brands, the phone is not on the same brand as the messenger and since theirs no email associated with the messenger I can not style it for our phone line.