Yealink- Multicast Paging

What is Multicast Paging?

It's a feature of the Yealink phone that activates the speaker of other phones within same network in order to broadcast/transmit a message.

How does it work?

Whereas most features of a hosted PBX deployment are implemented using the SIP protocol controlled by the cloud-based PBX platform, paging is actually handled entirely by the phones themselves using an IP technology named multicast.

Basically what happens is that you configure each phone within the paging group to “listen” to a certain multicast IP address (there are ranges of IPs that are set aside for multicast and can’t be assigned to devices). Then when a phone wants to broadcast audio to these phones it sends out an RTP stream to this same multicast IP and port, and the local network switches and routers forward these RTP packets on to the listening phones. The listening phones then play the RTP stream out of their speakers as soon as they receive the packets.

This needs to be supported by the local IP network, but multicast is a pretty standard technology that’s widely supported. Of If the phones are spread over multiple subnets then things may get a little more complex, but it can still work (see this article from Microsoft for more details).

What happens if I’m on the phone when a page comes in?

The short answer is that by default the page will interrupt your call and place the other party on hold. If you want a phone call to always have priority over the page, you need to add the following:

Directory > Multicast IP > A setting of 0 sets the phone call to the highest priority (above all pages).


Configure a multicast paging key (This is to SEND the page) via phone's web interface:

  1. Locate your phone’s IP address and enter it on a web browser within the same network as your phones. This will give you access the Yealink web interface for each phone.

    Username = admin
    Password = admin

  2. Click on DSS Key
  3. Click on Line Key
  4. In the desired Line select "Multicast Paging" from the Type dropdown menu.
  5. Enter the following multicast IP address and port number in the "Value" field = (Yealinks on the boot server will use this universal IP and port, not what is listed in the Yealink User Guide).
  6. Click "Confirm" to accept the changes.
  7. There will not be a 'button' on your phone, you will simply have to know that whichever Line you just configured is the one you press (ie Line 2, press button 2 on your phone to send the page).



Codec for Multicast Paging:

  1. Click on the Features tab.
  2. Click General Information in the left of your screen.
  3. Scroll down to find Multicast Paging.
  4. Select the following Codec: G722 from dropdown.
  5. Click "Confirm" to accept the changes.

    If G722 codec is used for multicast paging, the LCD screen will display the icon to indicate that high definition voice is provided.



    Receive the Multicast Page

    In order to receive the multicast page, the following must be done.

    1. Click on the Directory tab.
    2. Click MulticastIP in the left of your screen.
    3. Make certain Paging Barge is '10' and Paging Priority Active is Enabled.
    4. Enter the 'Listening Address' and port number as done above ->
    5. Enter the label in the Label field.  In the example we simply called it "Page All".
    6. Click "Confirm" to accept the changes. 



Paging Priority Active

The paging priority active parameter decides how the phone handles incoming multicast paging calls when there is already a multicast paging call on the phone.

If enabled, the phone will ignore incoming multicast paging calls with lower priorities, otherwise, the phone will answer incoming multicast paging calls automatically and place the previous multicast paging call on hold.

If disabled, the phone will automatically ignore all incoming multicast paging calls.



Sending a Page

To start using the feature simply press the button labeled Page All on the idle phone.

The phone sends RTP to a preconfigured multicast address (IP: Port). Both the sender’s and receiver’s phones play a warning tone and the receiver automatically answers the multicast RTP session in the hands-free (speakerphone) mode. The multicast paging key LED illuminates solid green. The following figure shows a multicast RTP session on the phone:



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