immediate Approach
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3CX Software Products
3CX Phone System Call Center Module Hotel Module CRM Integrations Multi Tenant Edition Voice Application Designer 3CXPhone for Android 3CXPhone for iOS 3CXPhone for Windows 3CX Mobile Device Manager 
SIP VoIP Phones
Yealink HD IP Phones Polycom HD IP Phones & Conference Phones Cisco IP Phones Snom IP Phones Grandstream HD IP Phones Quartel IP Phones 
SIP Voice Gateways
Patton Digital and Analog Gateways Grandstream Analog Gateways Portech GSM Gateways 
SIP Analog Adapters
Linksys / Cisco ATA Grandstream ATA