GAI-Tronics VoIP Basic Programming Guide - Manual (Page 22)

Pub. 42004-481B
VoIP Telephone Basic Programming Guide Page 21 of 28
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Multicast Settings Page
Multicast allows a single audio stream to be sent to multiple endpoints simultaneously, to achieve multi-
point paging or Public Address functionality over IP. As such, it is only applicable to telephones with a
loud-speaking capability, such as hands-free units.
N OTES :
 Multicast requires the use of a SIP server that specifically supports it, and each endpoint (i.e.,
telephone) must be individually configured to receive multicast packets.
 When making a multicast call, the SIP server will send a paging request to a specific IP address and
expect multiple phones to accept and play the subsequent audio.
 The GAI-Tronics telephone can be programmed with up to eight multicast IP addresses to allow the
receipt of multicasts from different sources or to enable zoning of multicasts.
 Each multicast address can be assigned a priority to define which can override which.
 Although Multicast is factory enabled, a telephone can still make and receive normal calls. Normal
calls can also be assigned a priority level, defining whether calls can override multicasts or vice versa.
Figure 10. Multicast Settings Page