* Terminate traffic only (from a shared shortcode originator)
* Two-way traffic via a VMN. To save allocating huge numbers of VMNs to Matrix users, the VMN can be allocated from a pool such that each {caller,callee} tuple is unique (but the caller number will only work from that specific callee).
* Two-way traffic via a VMN. To save allocating huge numbers of VMNs to Matrix users, the VMN can be allocated from a pool such that each {caller,callee} tuple is unique (but the caller number will only work from that specific callee).