GRANDSTREAM GSC3506 SIP or Multicast Intercom Speaker Installation Guide
Learn how to properly configure and use the GRANDSTREAM GSC3506 SIP or Multicast Intercom Speaker with this user manual. This powerful SIP speaker offers crystal clear HD audio and built-in whitelists, blacklists, and greylists for easy call blocking. Perfect for offices, schools, hospitals, and apartments. Get the most out of your GSC3506 with this comprehensive guide.