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Requirements Continued REQ-7 Each UA in the group must be able to learn the line appearance status of the the group. REQ-8 There must be mechanisms to resolve appearance contention among the UAs in the group. REQ-9 The mechanism must allow all UAs receiving an incoming session request to select the same appearance number at the time of alerting. REQ-10 The mechanism must have a way of reconstructing appearance state after an outage that does not result in excessive traffic and processing. REQ-11 The mechanism must have backwards compatibility such that a UA which is unaware of the feature can still register against the group AOR and make and receive calls. REQ-12 The mechanism must not allow UAs outside the group to select or manipulate appearance numbers. REQ-13 For privacy reasons, there must be a mechanism so that appearance information is not leaked outside the group of UAs. (e.g. "So who do you have on line 1?") |