Use complete phone number as JID
Invite to room by phone number
Whisper to a phone number without full JID
stitch together long messages
Enable setting nickname
Keep up-to-date on room config
Outbound invites
When join room invited to, remove invite
command to leave room
Print errors at least
Nice phone number contact add form
Those are not errors
Allow people to get presence from the gateway itself

Needed for clients to think that we have "signed in" to SMS
Service discovery
Return errors to SMS user