SR01 / SR01B SIP Ringer with Beacon Option » advance-NET
Photo4Less | Algo 8180 IP Paging and SIP Loud Ringer Audio Alerter+ Algo 8186 SIP Paging Speaker and IP Loud Ringer+Algo 8301 IP Voice Paging Adapter & Bell Scheduler+ 5 8″ Black
CyberData 011216 V3 Sip Office Ringer for $494.79.