ScopTEL - Configuring Paging Features

ScopTEL - Configuring Paging Features

ScopTEL Paging Features

ScopTEL supports multicast paging with supported SIP devices.  Multicast paging is extremely efficient and puts minimal stress on the host CPU. The Local Area Network determines the number of devices in a Multicast Paging Group therefore multicast paging is very scalable.
Most Yealink, Snom, Aastra, Algo, Panasonic, Linksys, Vtech, and Cyberdata devices support open standard multicast paging and multiple multicast listen addresses.

Polycom, SpectraLink, and Algo devices only support Polycom proprietary multicast paging since firmware version 3.X

Algo and Cyberdata SIP paging devices support Multicast Relay forwarding and register as SIP extensions.  These paging devices also supply 600 ohm external paging connections for external paging amplifiers and loud bell extensions.

Because Polycom and SpectraLink do not use interoperable multicast paging protocols it is not recommended to mix Polycom and SpectraLink devices with other devices types on the same LAN. If multicast paging will be deployed consolidate your vendors for each customer location.

ScopTEL also supports scheduled paging tasks to automate lockdown procedures or other implementations.

Pre-recorded announcements can be scheduled for playback using scheduled automated tasks or played back by dialing a feature code.

ScopTEL supports paging using Meet-me in Asterisk but this method is not scalable.  It is suitable for usage only in very small environments where either the SIP phone or network does not support multicasting.

The recommendation is not to configure more than 5 concurrent extensions when using Meet-me paging and use multicast paging whenever possible.

ScopTEL supports 1 to 1 two way hands-free paging which is referred to as Intercom.  In this mode both parties can communicate directly with each other.


For more information regarding multicasting please visit

The number of extensions which can subscribe and receive pages from the multicast group is only limited by network performance.

Phone can subscribe to any valid multicast address and port and thereby create multiple paging zones.

Multicast paging uses minimal CPU resources on the ScopTEL CPU

Hosted customers require some SIP device which can forward multicast pages onto the customer LAN since multicasts are not normally forwarded across VLAN’s or routers.  One such device which is very flexible is available from Algo Solutions.

The Algo 8180 SIP Alerter can forward the multicast page to any SIP device which supports industry standard multicast paging, or Polycom, SpectraLink proprietary paging.

Preparing ScopTEL to support Multicasting

Go to the Network IP Routing tab and build this route for multicasting paging support.
Commit your changes on the network module when done

Edit the Multicast Paging tab and set at least one Multicast Page Group with a Listen IP/Address.  Make sure all MAC addresses use the same Listen IP/Address or use a template to assign the Multicast Paging Groups to all your phones
Save your changes and commit and reboot all the phones to download the new settings

Other vendors use similar settings and tabs so edit as necessary.

Preparing a Yealink Phone for SIP-Alert
Edit the Yealink Extension|Phone Options tab
SIP Alert (Auto Answer/Distinctive Ring)

Device : Yealink

Check the option for Pager and Intercom

Save your changes

This will prepare the Yealink phone to receive ‘Intercom’ two way hands-free calls

Intercom Usage:

Go to the Features Code section and define a feature code for the Intercom feature

Edit your Class of Service and ensure that Intercom is allowed in the Service list

Dial the Intercom code and the target extension number to activate two way hands-free Intercom

Creating a Multicast Paging Application

Go to Applications and create a new Application.
Assign an extension number to this application which does not conflict with any other extensions on the server.
Click on Destination when done

In the Destination drop list choose Paging and Intercom and then click on the Paging and Intercom tab
OPTIONAL: You can check the Allow Extensions to use this application as destination if you want Ring Groups to access this feature.  This can be useful if you want the application to be available in an IVR menu for direct dialing.

Use the Select button to add your Paging Members.
Choose Multicast RTP in the From list drop down menu
Enter a multicast address and port which matches what you define in the APS and click Add
Click OK and finish adding your changes.
Once you have added the Application make sure you Edit your Class of Service permissions so your extensions can dial the new Application code.

Creating a Meetme Paging Application

If you don’t want to use multicast paging there is the option to use Meetme paging.  To configure this instead of choosing Multicast RTP in the Select context choose one or more SIP extensions to include in the paging zone.  Keep this list small, less than 5 extensions.  Meetme paging uses a lot of CPU on the host server and the signalling is best effort. Meetme Paging is available as a native feature in Asterisk but definitely not recommended. Meetme Paging will not work unless dahdi is compiled properly on the active Kernel. To test dahdi you can execute these commands (omitting quotes):
[root@master88 ~]# timertest
Opened timer...
Set timer duration to 8000 samples (1000 ms)
Timer Expired (1000 ms)!
Timer Expired (2000 ms)!

'dkms status'
[root@master88 ~]# dkms status
dahdi, 2.11.1-11.el7.scopserv, 3.10.0-1127.19.1.el7.x86_64, x86_64: installed
wanpipe, 7.0.26-1.el7.scopserv, 3.10.0-1127.19.1.el7.x86_64, x86_64: installed

If either of these tests fail you will have to repair dahdi/wanpipe:

Creating a Paging application to a Auto Answer Paging Peripheral

Another option is to have a multicast forwarding device or SIP device with a 600 ohm paging output selected ie. Algo or Cyberdata.  This is the recommended solution for sending a pre-recorded announcement/scheduled task objects to an overhead Paging Amplifier. In this scenario create a SIP extension for the device, manually provision your paging device and set its extension number in the Select Dialog.

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