What is an ITSP or VSP?
ITSP stands for Internet Telephony Service provider and VSP stands for Voice over IP Service provider these companies that provide an IP telephony service. So all you need to do is to have an IP phone or ATA or PBX or VoIP router in your hand and then sign up with K, you can sign up at www.k5.com.au. Once your account is setup, you can configure your device using the instructions on our FAQ – Configuring Your Device page and start making and receiving calls.
