trulyme,
Clarify:
Are you connecting to voipms:
1) Softphone+OBiAPP,
2) Softphone only
Voipms site:
Ring Groups
The Ring Group feature allows you to have incoming calls to be redirected to different destinations that are included in your Ring Group, where a member of the group is able to answer. When you receive a call to a DID routed to a Ring Group, all members of that group will ring at the same time until one of them answers the call. You can add various types of members to a ring group: Main Account, Sub Accounts, SIP URI's, Call Forwarding.
I am correct in assuming you set it up as a different (unique) sub-account? In other words, not using the same credentials as the OBi.