Grandstream Networks GSC3516 User Manual page 14

As soon as a SIP call is received by the GSC3516/GSC3506, it first checks if the Caller ID number is allowed on the Whitelist
and then answers automatically.
Notes
GSC3516 is an intercom system and auto-answers all whitelisted numbers.
By default, GSC3516 plays a Warning tone when auto-answering incoming calls, this warning tone can be disabled under
Account �� Account X
Multicast Paging Application
Multicast paging is an approach to let different SIP users listen for paging calls from a common multicast IP address. In
multicast page calls, an audio connection will be set up from sender to receiver, but the receiver will be only able to receive
audio, a one-way communication. The 2 entities, Sender/Receiver, must be located on the same LAN (same broadcast
domain).
To receive a multicast page, GSC3516/GSC3506 must be well configured to listen to the right address and port. The
configuration is located under Phone Settings → Multicast/Group Paging. Up to 10 listening addresses are supported with
priority levels from 1 to 10.
Note: Multicast paging configuration requires a reboot to take effect.
In the above screenshot, the Listening Address "237.11.10.11:6767" with the label "Sales" has the highest priority.
Users can enable the "Paging Priority Active" option (under the Multicast Paging tab) to accept incoming paging calls during
active multicast paging. The paging call with a higher priority than the active one will be accepted.
Whitelisted Devices
�� Call Settings, "Play Warning Tone for Auto Answer Intercom".
Multicast Paging Listening Addresses