The Grandstream solution.
MVC's engineering team remotely supplied, configured,
and commissioned a UCM6300A IP PBX with SIP extensions
for the M20 microphone console, both GDS3702 audio
intercoms, and the GSC3518HS horn speaker.
Press 1
GSC3518HS speaker
Press 2
GDS3702 intercom — Unit 1
Press 3
GDS3702 intercom — Unit 2
Press 4
Combined speaker + intercom paging group