CrewPTT

Hardware

This feature is supported by the N670 (Internal telephony role must be disabled. Coming soon for N770 and N870)

Up to ... CrewPTT groups

You can create up to 2 CrewPTT groups per DECT Manager. (Planned, up to 20 CrewPTT groups for an XXL Integrator system)

Up to ... CrewPTT group members

N670: Up to 20 DECT headsets/handsets

N770/N870: up to 50 DECT headsets/handsets (Coming soon)

The CrewPTT group SIP account is not counted as member

Up to ... simultaneous connections

Up to 6 simultaneous DECT calls + 1 SIP call per CrewPTT group

Supported devices

The following devices are supported:

• DECT headsets (Coming soon)
  • Gigaset CH41D
  • Gigaset CH21D
• DECT handsets (Via software update)
  • S700H
  • R700H
  • SL800H
  • R700H Protect
  • SL850H
• CrewPTT group SIP account

Installation of the DECT system

Install the DECT system conform the provided training/documentation/wiki.

Software

Upgrade your DECT system with the software 2.67 or higher.

Upgrade your DECT handsets (if required) with the latest software.

Configure your CrewPTT groups

Open the DECT system web-interface: Go to SETTINGS - CrewPTT

Click on to edit or   a new group.

 Resources

CrewPTT groups require resources on the base station.

We have created a tool that can be used to calculate the required resources. 

Base stations under the same DECT manager can handle maximum 2 CrewPTT groups.

A Base station must be selected that acts as the conference bridge for a CrewPTT group.

Enabling CrewPTT or using a Base station as Conference bridge takes resources, therefore the tool to calculate the free call capacity.

Example: All-in-one system example, one floor - max 2 groups.

All-in-one system can handle maximum 2 CrewPTT groups

For each group a DECT base must be assigned as Conference bridge

Example: All-in-one system example, multiple floors - max 2 groups

All-in-one system can handle maximum 2 CrewPTT groups

For each group a DECT base must be assigned as Conference bridge

To cover the 2e floor an additional DECT base is added, also coverage from DECT base floor 1

Example: More then 2 groups are required (Coming soon)

Install a second all-in-one system

• First system handles CrewPTT group 1-2
• Second system handles CrewPTT group 3-4
• Also the DECT bases must be installed for the 2e all-in-one system

Handsets and headsets that belong to group 1-2 are registered to 1^th system

Handsets and headsets that belong to group 3-4 are registered to 2^e system

Telephony between the systems are done via the SIP platform

There is no handover and roaming between the systems

It can not be one Integrator systems as:

• Handsets and headsets should not roam to other DM as the CrewPTT groups are DM dependent.
• Roaming in an integrator system can't be blocked !!!

Example: Integrator system example (Coming soon)

2 TeamCOM groups per DECT manager is supported

• Group 1-2 only available at DM A
• Group 3-4 only available at DM B

Handset or headset can roam to other DM

If assigned, the handset or headset can switch to group of other DM

If there is an DM overlap, handsets or headsets switch automatically between DM's and with this leave the joined TeamCOM group.

Therefore using more then 2 groups, there should not be an overlap between DM A and DM B DECT area's.

DECT handset/headset configuration

After registering the DECT handsets and Headsets, you need to configure the CrewPTT settings.

Go to: SETTINGS - Mobile devices - Administration - Select your handset/headset.

Push-to-talk configuration via the handset

Open the handset menu and go to: Additional Features - CrewPTT

Join PTT group

How to join a PTT group:

In the CrewPTT settings menu, enable Activation to Join the selected PTT Group

The soft-key "Join" is available

Click "Join" to join the PTT group

The soft-key will be changed to "Leave"

Click "Leave" to leave the PTT group

When you Joined the PTT group, you will see:

• PTT group name
• Icon

Listening mode

When a PTT call is started, the handset that joined the group will play the audio via the:

• Handset
• Wired headset if connected
• Bluetooth headset not supported

On the display you will see.

• Headline: PTT Listening
• Icon indicating listening mode
• PTT Group name

In the Listening mode, the Soft-key Options offers the possibility to:

• Talk lock feature
• Leave the PTT Group
• Open the PTT Group Settings menu

Press the End key to temporarily leave the PTT Group, to for example start a SIP call.

You will not listen to existing PTT group conversations. You will automatic be switched back to listening mode when a Group member that was in listening mode starts talking in that group.

Pressing the End key has no influence on the other PTT group members.

Initiate a Push-to-talk call

You can start a Push-to-talk call using the configured Soft-key Talk.

The handset will switch to PTT Talking mode.

• Headline: PTT Talking
• Icon
• PTT group name

Release the Talk key when you finish speaking

PTT Lock

The PTT Lock will allow you to talk to other PTT members without holding the Soft-key Talk.

How to Activate:

Press the soft-key Options when the handset is in Listening mode, then select Lock.

How to end:

Press the soft-key Unlock or automatic after maximum lock timer has finished (By default: 3 minutes)

The handset will return to Listening state

Leave PTT Group

How to leave a PTT group:

Via the CrewPTT settings menu:

• In the CrewPTT settings menu, disable Activation to leave all PTT Groups

Handset Joined the PTT functionality and is in IDLE mode.

• Press the Soft-key Leave to Leave the PTT group

Charging Cradle

If the DECT handset is on the Charging Cradle and an PTT call is started, the handset will join the PTT group and play the audio via the speaker.

If you take the handset from the charger, the PTT call will not be disconnected.

If the DECT handset is in a PTT call and the handset is placed on the charger, the PTT call is not disconnected.

Switch between PTT groups

The system supports up to 2 PTT Groups per DECT manager.

Both groups needs to be configured to be able to switch between the groups.

How to switch between the Groups.

Handset in Idle state:

On the DECT handset open the Menu - Push to talk - select the PTT group

Handset in PTT Listening state:

Press the soft-key Options when the handset is in Listening mode, then select Switch group.

Wired headset

It is possible to use a wired headset with the following requirements:

• Small 3.5mm plug, CTIA standard
• With PTT button

You would need to search for a security headset with the above PIN layout like the for "Zello APP" developed headset below.

When you press the PTT button, there is a shortcut of the Microphone with Ground. This means that you can not talk as the microphone will not work.

Usage:

• Short press PTT button, you are in talk lock state
• Short press PTT button again to go to listening state

To use wired headsets you need to adjust the Headset/microphone volume/sensitivity. Example: With the above headset, the microphone sensitivity was needed to set to the lowest level 1.

Headset microphone Sensitivity: On the handset, long press microphone (Center key - right), Corded headset

Headset speaker volume: On the handset, press volume key (Center key - up), handset volume, Corded headset

Headset On/Off

The headset can be switched on/off via the on/off switch.

If the headset is configured as CrewPTT user, the headset will be assigned to the first CrewPTT group of the connected DECT Manager.

The following audio prompts are supported:

1. ON+connected: "Connected"
2. ON+not connected: "No connection"
3. ON + no CrewPTT group: "No group"

CH41D:

Turn On

Turn Off

CH21D:

Turn On: Press and hold the push-to-talk button for approx. 2 seconds.

Turn Off: Press and hold the mute button for approx. 4 seconds.

Push-to-talk configuration

The configuration of the DECT headset is done via the DECT system web-interface

Join PTT group

The headset is part of the configured PTT group, done via the DECT system web-interface

The headset will automatically join the last joined PTT group or the first PTT group in case the headset never joined a group before.

When another group member starts a PTT call, your headset will automatic switch to listening mode.

LED blinking 100ms(On), 4900ms(Off)

Un-join all PTT Groups

If the administrator has assigned the PTT group "No group" the user can switch to this group and will then not be part of any PTT group but still can receive SIP calls

Listening mode

When a PTT call is initiated, the headset that is member of the group will play the audio.

The microphone is muted.

Talk back: Press and hold the push-to-talk button, you will hear a BEEP and then you can talk to other participants.

LED blinking 100ms(On), 4900ms(Off)

Initiate a Push-to-talk call

Press and hold the push-to-talk button, you will hear a BEEP and then you can talk to other participants.

Release the push-to-talk button when you finish speaking, the other PTT group members can't hear you any-more.

There is no time limited when manually pressing the Hook button, that the conversation is automatically ended.

When there are no resources available to talk, then the user will be notified via an audio indication.

PTT Lock

Press the push-to-talk button multiple time (during start of the call) to enter the Lock state. Multiple time press when the call is already started, will not start the lock state.

The Lock will allow you to talk to other PTT members without holding the push-to-talk button.

LED blinks 500ms(On), 1500ms(Off) 

How to end:

Press the push-to-talk button or automatic after maximum lock timer has finished (3 minutes), via provisioning this timer can be changed

An tone will be played to indicate the user the lock state is ended

The headset will return to Listening state

Face-to-face mode (Mute of the Speaker)

The Face-to-face mode allows you to talk to a person without being disturbed by PTT calls.

Short press the F2F/Mute button.

An audio prompt will be played "Group muted".

The user is informed every minute with an audio prompt "Group muted"

How to end the face-to-face mode:

Press the F2F/Mute button

An audio prompt will be played "Group un-muted"

Switch between PTT groups

Short press: group name check

An audio prompt will be played "Group ...".

Short press "again" within 3 sec after previous short press → selects next group with wrap around;

You can only switch between groups if the headset is in IDLE state.

Incoming SIP call

LED blinks 200ms(On), 800ms(Off)

Short press push-to-talk key: accepts incoming call

Press again to disconnect the call

If the Face-to-Face mode is activated, on incoming SIP call is signaled normally.

In charger

Factory reset

Hold: (Mute + P2T + Softkey) then power on

DECT registration

Set the Power/DECT switch for 3 seconds on the DECT position

Status LED blinks Blue and Busy LED Red

DECT registration is active for 5 minutes

Incoming SIP call, PTT group is not started.

An incoming SIP call will initiate a PTT call, all members can hear the caller.

To be able to talk back, the PTT member needs to initiate a PTT call.

When already members are speaking, the SIP caller can hear the messages.

Incoming SIP call, PTT group is already started.

The SIP caller can hear the messages and talk back.

6. SIP Calls

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Each DECT handset and/or DECT headset have an own SIP account

SIP Calls always have higher priority then PTT Calls

User is in a PTT call and receives an SIP call

If the user is in a PTT call and his SIP account is called, the PTT call will be interrupted and the SIP call is signalised. (Call waiting when in talking state)

The user can accept the SIP call.

When the SIP call is ended, the user will rejoin the PTT call in case the call is still active.

If the PTT call has ended, the device will return to IDLE state.

User is in a SIP call and receives an PTT call

If the user is in a SIP call and he receives an PTT call, this is not signalised to the SIP call participants.

The user stays in the SIP call and has no information that the PTT call is started.

When the SIP call is ended, the user will rejoin the PTT call in case the call is still active.

If the PTT call has ended, the device will return to IDLE state.

User is in a PTT call and wants to start an outgoing SIP call

If the user is in a PTT call and he wants to start a SIP call.

Press the End key to temporarily leave the PTT Group.

You will not listen to existing PTT group conversations. You will automatic be switched back to listening mode when a Group member that was in listening mode starts talking in that group.

User is in dialling state, phone-book access or has a handset menu open

Only if device = DECT handset

If the user is not in IDLE state but for example, starting to dial a number, searches for a phone number or has a handset menu open.

The user receives an PTT call, this is not signalised to the user.

When the handset goes to IDLE mode, the user will rejoin the PTT call in case the call is still active.

If the PTT call has ended, the device will stay in IDLE state.

User is already in a SIP call and receives a 2e SIP call

This is not supported for headsets as there is no MMI to operate multiple calls.

PTT Group unavailable

If a user wants to initiate a PTT call, in the following failure cases an audio tone is played.

• The device can not connect to a DECT base that Broadcasts the PTT group
• The PTT group is not active for example:
  • Master DECT base is not selected or offline
• The device leaves the DECT bases that Broadcasts the PTT group

All DECT channels busy

If a user wants to initiate a PTT call, in the following failure case an audio tone is played.

The user initiates an PTT call but there are no DECT channels available

Maximum simultaneous calls

If a user wants to initiate a PTT call, in the following failure case an audio tone is played.

The maximum simultaneous calls for the Group setting is "3" and the fourth user initiates a PTT call.

Which multicast address is used

• Each CrewPTT group is using it's own multicast address

• The multicast address is automatically created

  Calculate Multicast IP address

  • Default Multicast IP address

    Format:   239.<CRC byte 1>.<CRC byte 2>.<Group1:0 Group2:128>

    The CRC can be calculated with the following online tool: https://www.sunshine2k.de/coding/javascript/crc/crc_js.html
    
    Use the settings below with CRC Input Data = Your device MAC address, in the example below: 589EC600C8A9
    
    
    
    Convert the first two bytes of the CRC result from hex to decimal.

    Example: 0xA7 → 167, 0x44 → 68

    First group of a single DM: 239.167.68.0

    Second group of a single DM: 239.167.68.128
    
    

• The port is calculated if the provisioning parameter MulticastIpPort = 0
  port number 46000 + 100*<DM-index>+<group-index>.

  Calculate Multicast Port

  • <DM-index>:
       "local" => 0
       "dm1" => 1
       "dm2" => 2
        .....

    <group-index>
       "ptt_00001" => 1
       "ptt_00002" => 2

• If required, via provisioning this can be changed

What happens if another device is using the same multicast settings

• When the other device is broadcasting then there will be be audio played in the CrewPTT group.

Which syslog information is available?

• Maximum number of talking users is reached and another person wants to talk:
  Rejecting PTT connect request, too many talking BEPs