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  • 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 

ImportanceStatusNotes
1

D8XX_BLF-XML_FR-1-UAC

On D8xx IP phones, any PFK (programmable function key - physical or virtual) can be assigned to a function, which allows monitoring state changes of the configured SIP extension on another IP phone.

This

 This function shall be called "BLF-XML". The following state changes

of the monitored SIP extension

shall be visualized:

  • monitored SIP extension is in idle mode => idle
  • monitored SIP extension receives an incoming call => ringing
  • monitored SIP extension dials or accepts an incoming call => busy

Must Have

Status
titleDRAFT

This means, that

each PFK of the

the D8xx phone acts as a User Agent Client

(UAC, here Snom D8xx) becomes a subscriber of state changes of the assigned SIP extension on the

and the IP phone of the monitored extension as a User Agent Server (UAS).

2

D8XX_BLF-XML_FR-1-UAS

On Snom IP phones, any SIP extension having an active subscription of its state changes, shall sent a notification SIP message (NOTIFY) to the

UA

UAC,

everytime

at least when one of the following state changes occur:

  • from any state => idle
  • from any state => ringing
  • from any state => busy

Must Have

Status
colourGreen
titleIMPLEMENTED

Fully implemented for idle, ringing, busy

3D8XX_BLF-XML_FR-2If such SIP extension is configured on other Snom phones in the same SIP domain, BLF shall work transparantly without the need of
an
a B2BUA (IP PBX
.
)

Must Have

This means, that any Snom phone, acting as SRV, is capable of sending its state via NOTIFY messages to the UA

Status
colourGreen
titleIMPLEMENTED

Fully implemented
4D8XX_BLF-XML_FR-3The 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

Already

Status
colourGreen
titleIMPLEMENTED

Fully implemented
5D8XX_BLF-XML_FR-1-1-UAC

On D8xx series, during an active subscription, state changes of the monitored SIP extension shall be visualized on both, PFK LED and PFK label.

Must Have

Image RemovedImage RemovedImage Removed

Status
colourGreen
titleIMPLEMENTED

Fully implemented

6D8XX_BLF-XML_FR-1-1-1-UAC

The PFK LED shall be 

  • from any state => idle
  • from any state => line seized
  • from any state => ringing
  • from any state => busy or talking
  • Off, when state is "idle"
  • Blinking, when state is "ringing"
  • Steadily lit, when when state is "busy"

Must Have

Status
colourGreen
titleIMPLEMENTED

Fully implemented

7D8XX_BLF-XML_FR-1-1-2-UAC

The default PFK LED color shall be 

  • red, when state is "ringing" or "busy"

Must Have

Status
colourGreen
titleIMPLEMENTED

The default colour can be overridden by configuration

8D8XX_BLF-XML_FR-1-1-3-UAC
7

The PFK label is composed of 3 areas

:

  • (A)
Label icon, (B) name, and (C) state, where
  • icon area
    • state
Label icon
    • "idle"
shall be a
    • => white
outlined
    • symbol of a person with handset
Label icon
    • state "ringing"
shows a red outlined symbolic
    • => red symbol of a person with handset
and
    • plus an arrow pointing towards the handset
Label icon
    • state "talking"
shows a red outlined symbolic
    • => red symbol of a person with handset and
wave
    • 2 waves heading away from the handset
  • (B) name area
  • (C) state area



Image Added

9

Image Removed

8
D8XX_BLF-XML_SR-2-UAS

If the SRV (Snom phone) goes into State "Idle", a NOTIFY message shall be sent to the UA, containing the following information in its XML body:

  • switch off the assigned PFK LED
  • display the label icon "idle", the label name "name" or "number", the state "idle"
Must Have

Image AddedImage AddedImage Added

9
10D8XX_BLF-XML_SR-2-UAC

If the SRV (IP-PBX or another Snom phone) is in State "Idle", the UA shall

  • switch off the assigned PFK LED
  • display the label icon "idle", the label name "name" or "number", the state "idle"
Must Have
10


11D8XX_BLF-XML_SR-3-UAS

If the SRV (Snom phone) goes into State "Line seizing", a NOTIFY message shall be sent to the UA, containing the following information in its XML body:

  • switch off the assigned PFK LED
  • display the label icon "idle", the label name "name" or "number", the state "idle"
11



12D8XX_BLF-XML_SR-4-UASIn case the notifier being an IP-PBX or another Snom phone: Ringing state => PFK LED blinking fast (colour?), PFK label & icon "ringing"Must Have
12


13D8XX_BLF-XML_SR-5-UASIn 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
13


14D8XX_BLF-XML_SR-6-UASIn case the notifier being an IP-PBX: Hold state => PFK LED blinking slow (colour?), PFK label & icon "on hold"Must Have
14


15D8XX_BLF-XML_SR-7-UASIn case the notifier being an IP-PBX: DND state => PFK LED on (colour?), PFK label & icon "DND on"Must Have

User interaction and design

...