Avoid ending ring in all other end point on incoming call while being in OS DND...
Avoid ending ring in all other end point on incoming call while being in OS DND mode (that is not the presence mode)
rfc3261 : 600 Busy Everywhere This status response is returned only if the client knows that no other end point (such as a voice mail system) will answer the request. Otherwise, 486 (Busy Here) should be returned.
Edited by Julien Wadel