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Target release	1.0
Epic
Document status
Document owner	Alexander Feldt
Designer	Zsolt Erdei
Developers	Clemens Cramer
QA	Tita Petre

Goals

Align BLF and Extension behavior for PFKs on Snom desk phones by using XML definitions instead
- Improve user experience
- Improve performance

Background and strategic fit

BLF is a valuable feature for Snom customers, like enterprises who are looking to assist in connecting their customers to a live, available person as well as save business phone use time. Overall, it enables businesses to streamline their communication and better serve customers. BLF aka Extension monitoring has been utilized in numerous ways by businesses using Snom phone systems with multiple extensions. The current implementation appears to be kind of duplicated, but with a few little differences and erroneous behaviour.

Assumptions

Use case#1: A secretary's phone shall display the call status of the boss's line, allowing the secretary to know whether the boss is on a phone call or not. This will enable the secretary to make the decision to put the new caller on hold or let them through to the boss.
Use case#2: Call centers and customer support groups have also a need for BLF: it enables employees to see if their colleagues are free to take a support call or if their supervisor is on another line and unable to help another customer.
Use case#3: BLF is needed by teams working on a specific project: supervisors can monitor team members' extensions and vice versa so all team members are aware of each other's current status.

Requirements

#	Title / Requirement number	User story / functionality	Importance	Notes
1	BLF-XML-01-00	On D8xx series, any PFK (physical or virtual programmable function key) can be assigned to the function BLF-XML.	Must Have	In technical terms, this means, that each PFK becomes a subscriber of state changes of the assigned SIP extension
2	BLF-XML-01-01	The assignment shall be configured either manually via web user interface (WUI) and/or phone user interface (PUI), and automatically via auto-provisioning (HTTP/TFTP setting server), SRAPS, or remote management (TR-069).	Must Have
3	BLF-XML-01-02	If such SIP extension is configured on other Snom phones in the same SIP domain BLF shall work transparantly without the need of an IP PBX.	Must Have
4	BLF-XML-02-01	On D8xx series, during an active subscription, state changes of the monitored SIP extension shall be visualized on both, PFK LED and PFK icon & label.	Must Have
5	BLF-XML-SUBS-02-02	In case the notifier being an IP-PBX or another Snom phone: Idle state => PFK LED off, PFK label & icon "idle"	Must Have
6	BLF-XML-02-03	In case the notifier being an IP-PBX or another Snom phone: Ringing state => PFK LED blinking fast (colour?), PFK label & icon "ringing"	Must Have
7	BLF-XML-02-04	In case the notifier being an IP-PBX or another Snom phone: Busy state => PFK LED on (colour?), PFK label & icon "on a call"	Must Have
8	BLF-XML-02-05	In case the notifier being an IP-PBX: Hold state => PFK LED blinking slow (colour?), PFK label & icon "on hold"	Must Have
9	BLF-XML-02-06	In case the notifier being an IP-PBX: DND state => PFK LED on (colour?), PFK label & icon "DND on"	Must Have

User interaction and design

User interaction			Requirement reference		Design reference
Monitored extension	Monitoring extension	State	Monitored extension	Monitoring extension	Figma	Screenshot
does nothing	does nothing	Idle		BLF-XML-SUBS-02-02	Figma requirement (702 "idle")
lifts up the receiver	does nothing	Busy

Questions

Below is a list of questions to be addressed as a result of this requirements document:

Question	Outcome
(e.g. How we make users more aware of this feature?)	Communicate the decision reached

Not Doing

List the features discussed which are out of scope or might be revisited in a later release.