Setting up a multi-cell DECT (Poly or Yealink) in zoom ap

Multi-cell DECT IP systems use multiple DECT base stations to be connected to a VoIP system using various technologies such as roaming and handover. They are capable of providing broader coverage of the DECT signal, providing more handsets, and handling simultaneous calls more effectively than a single-cell system.

Poly

There is a setup guide on the Poly DECT multi-cell support site if you wish to set up the system.

Yealink

Note: A sample of each of the Yealink Multi-Cell DECT Systems, W80DM and W80B, will be used in this section to explain how the system should be set up. The W90DM and W90B can also be followed in this article if you are interested.

According to the following table, the following base stations are certified by Yealink:

Device	Description
DECT Manager for the W80DM	At least one
Base stations for W80B	There is a limit of 30 DECT managers per company
(Mobile Devices) - Handsets	DECT managers can handle up to 100 users at a time
Device	Description
W90DM DECT Manager	At least one
W90B Base Stations	Up to 60 per DECT manager
Handsets (Mobile Devices)	Up to 250 per DECT manager

DM connects directly to W80B (Base Station) through the internal network only, so no matter what distance the DM is away from DM, it will always be able to connect and sync with it. It is possible for handsets to roam and handover between bases with the DECT signal coverage provided by the base network, since the DECT signal is built into the handsets and is used to connect between bases.

Powering on the W80B

Use either method a or method b to connect power to the network.
a. Option for AC power supply
b. Option for power over Ethernet (PoE)

Upon reconnection to the power and the network, the LED status of the W80DM/W80B will appear as follows:

Base Mode Option	Role	DECT LED	ROLE LED	LAN LED
1	Base	Off	Green	Green
2	DM	Off	Orange	Green

Obtaining the IP address of W80DM and W80B

A W80B’s IP address can be obtained in two different ways:

Option 1 (recommended): Yealink Discovery Tool

1. The Yealink Discovery Tool can be downloaded from the Yealink website and installed.

2. Please open the Yealink IP Discovery Tool on your computer.

3. If you are using W80DM or W80B Base, you will need to enter the IP segment they are in. Here is an example of how an IP segment should be formatted:
   The IP address of this server is 192.168.1.0 [1, 3, 5-10]. [2-10, 15-200].

4. If you would like to find out the IP address and MAC address of W80B, click Scan.

The following is an example of what 192.168.0.[0-254] can be used to find out the W80Bs on the 192.168.0.X domain. Then click Scan to find out the W80Bs under 192.168.0.X. When you click Scan, all W80Bs will appear in the list, including DMs and bases, and you can find the corresponding IP address and MAC address from the list.

Option 2: DHCP server

1. Ensure that the DHCP option is supported by your local network.

2. If you would like to find the IP address of the W80B, you can use an application or your system.

Connecting the W80B base station to W80DM

There are two phases to the registration process: the discovery stage and the registration stage.

Making the W80DM discover the W80B 

1. The W80B base station has a web UI that can be accessed by signing in.

2. Click on Status from the left-hand navigation menu, followed by Base Mode in the submenu.

3. It is recommended that the IP address of W80DM be entered in the DM IP field in order to direct the base to the DM.

Registering the W80B to the W80DM

1. The W80DM can be accessed via the web UI by logging in.

2. There is a navigation menu on the left-hand side of the screen. Click on Base Station and then click on Base Station Registration. In the Operation column, click the icon.

3. Configure some base configurations that are related to this.
   As soon as the base is connected and synced with DM, it will update the firmware to be compatible with DM. There will be an Active and Synced status in the Base Station Settings as soon as the connection has been successful.

4. There is an option to edit the settings of the registered base station when you click Edit in the registered list.

A DECT LED on the W80B can also be used to determine the status of the base if it is activated and synchronized:

Base Mode Option	Role	DECT LED	ROLE LED	LAN LED
1	Base	Green	Green	Green
2	DM	Green	Orange	Green

Registering handsets on the W80 DM

Registration of a handset can be done in two ways.

• Manually registering a handset to the W80DM is recommended if you only need to register 1 or 2 handsets to the W80DM.

• In the event that you have more handsets to be registered to the W80DM and you wish to register them in a single registration process, you can do so using the Registration Center. As soon as the handset has been registered by the system, the associated SIP account that is bound to the handset will also be assigned automatically.

Registering Handsets Manually

1. The W80DM can be accessed via the web UI by logging in.

2. If you click Handset & Account on the left-hand navigation menu then click Handset Registration on the right-hand navigation menu.

3. Then click on the Add handset button.

4. To place the DM in registration mode, you need to click the Start Register Handset button.

5. In order to register your handset, press the OK button on the handset, then select Settings, then Registration.

6. In order to register the handset, you need to select the desired base.
   It is recommended that you use the pin code 0000 for pairing purposes. There will be a message on the handset stating “Handset Subscribed” once registration is successful.

Using Registration Center to register the handsets in a batch

1. The W80DM can be accessed via the web UI by logging in.

2. Please select Handset & Account from the left-side navigation menu, then select Handset Registration from the drop-down menu.

3. You will be able to add a handset by clicking on Add Handset.

4. You can optionally add the IPUI of the handset along with the SIP Account information, so that when the handset is registered to the W80DM, this account is bound to its corresponding handset as soon as the handset registers itself.

5. It is possible to check the IPUI code by navigating to OK > Status > Handset > IPUI Code on the W56H/W53 handset.

6. On the web UI, you have to click on Handsets and Accounts then Registration Center in order to register a batch of handsets at once.

Note: It should be noted that currently only one SIP account can be assigned to one handset, and that one handset can have only one SIP account.

Positioning the base station

Multi-cell DECT systems should have roaming and handover features as they are the most crucial features. When switching from one W80B base to another using DECT signal, you should test the quality of the call. If there are any spots with nearby base stations that have the DECT signal strength, the handset has a metering mode that can be used to check the strength of the DECT signal.

With the help of the metering data provided by the W80B, you can determine the best location of the W80B for coverage of the signal and synchronization of the signals.

Measuring the signal strength of the W80B

1. You can use metering mode on your handset once you have registered it to the base.

2. Set the position of the base in accordance with the preset position.

3. You need to dial 1383201# or 1234203# on the handset in order to make a call.

4. In order to enable measurement mode, you will need to navigate to Menu > Settings > Telephony > Metering Mode.

5. On the screen of the handset, check to see if the signal is working.

6. During an active call, the information will be displayed at the top of the screen if there is any available information. You can now verify whether the audio quality and connectivity between the bases are working properly and if roaming and handover functions are working correctly as well.

Metering mode parameter details

• RSSI: Indication of the strength of the received signal. Signal strength at the base station with the greatest reception in decibels (dBm).

  • Recommended value: – It ranges from 27 dBm to -85 dBm. This is subject to the actual call being made.
    Note: You can change the RSSI value from dBm to a percentage value if you wish. It is displayed as standard in dBm.

  • It is recommended to keep the RSSI above -80dbm in order to achieve good voice quality

  • There should be a difference in the RSSI value between -85 dbm and -90 dbm for good base synchronization.

• Fr. quality: The quality of the frame. In the previous measurement interval, the percentage of packages that were received with no errors was measured. It is important to ensure that frame quality is 100% in order to prevent packet loss;
  Recommended value: 100%.

• Base Station: Base station RPN (Radio Fixed Part Number). The handset’s connection to the base station is identified by this number.

• Frequency: Frequency of the carrier of the received signal.
  Value range: 0-30.

• Slot pair: The measurement was conducted on a specific reception channel.
  A duplex slot pair (0-11) is used.