I'm getting a busy tone when dialing from a 7960 cisco IP phone to a Cisco IP Communicator (Packet Tracer), show ephone displays "off hook". What have I missed? : r/networking
Connect Devices Together on a Cisco Small Business VoIP Router - Cisco
Cisco Packet Tracer Dial Up - Jesin's Blog
Configure VOIP Cisco 3 IP Phone dan 2 Analog Phone Packet Tracer - YouTube