Integrating SIP / VoIP Intercoms?

Looking for some advice, lessons learned and general knowledge on the topic.

Currently our intercoms are routed to a central station, where we use dedicates PCs and software for a little over 100 door stations from 20 sites. Over the next 5 years, we're planning to tripling the number of sites we monitor and looking to tie the intercoms to our CCTV and ACS systems to streamline...

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