CyberData Corporation
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RING CENTRAL CONFIGURATION GUIDE: SIP PAGING ADAPTER (SPA)
Doc. 931050B Page 9
Multicast Audio Sourcing
Multicast audio can be sourced from any industry standard multicast server. In a RingCentral
installation, we suggest two options to source multicast audio to the SPA:
• CyberData V3.1 Paging Server (Part #011146)
• Polycom IP Phones running UC Software version 4.0.0 and higher
The SPA supports simultaneous SIP and multicast audio sources. Each audio stream is priority-
based in order to allow higher priority audio streams to preempt lower priority audio streams like
background music.
For example, SIP calls are given a default priority of 4.5 on a scale of 0 – 9, where 0 is the
lowest and 9 is the highest. You may wish to use multicast to reach all paging devices in a
building for emergency pages. The SPA designates Priority Group 9 with a priority of 9 as the
emergency broadcast group. If you are using the V3.1 Paging Server to multicast background
music on Priority Group 0, as suggested, a RingCentral paging group call to the SPA will
preempt background music. If an emergency page to Priority Group 9 comes in at the same time
as the RingCentral paging group call, the emergency page will preempt both the RingCentral
paging group call and background music. Background music will resume when the emergency
and RingCentral paging group pages have finished playing.
Figure 3-2 shows a CyberData V3.1 Paging Server and a Polycom IP phone as multicast audio
sources.
In this example installation, you can place a call to the V3.1 Paging Server’s extension to make a
multicast page to the SPA and other multicast-enabled devices on the network. When installing
a V3.1 Paging Server and a SPA as part of your IP to Analog paging solution, you have the
option of connecting a music source to the RCA Line Level input of either device.
A Polycom IP phone’s Paging soft key can be used to make a multicast page to other Polycom
phones and the SPA, which will play the page out of the analog outputs to the connected analog
device.
See Section 8.0 “Multicast Configuration” for multicast configuration instructions.
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