IPTSP means Internet Protocol Telephony Service Provider. IP Telephony service is a general term for the technologies that use the internet protocols for voice communication service (Audio and video) through IP network. IP Telephony offers digital telecommunications services based on Voice over Internet Protocol (VoIP) that are provisioned via the Internet. BBTS providing a full featured IP Telephony solution through your existing Internet Connectivity.
https://www.bbts.net/iptsp.php
The main features of the service will include: