What is ITSP? What do you need to become ITSP?

ITSP is a company that provides telephony over VoIP connectivity, via IP phones, IPPBX.

ITSP stands for an internet telephony provider. So the first thing is what is Internet Telephony? We have all used PSTN and mobile phones for communications. Which uses a traditional SS7 network.  With the increased use of the internet and its high bandwidth option. Internet becomes a new network for telephony.  An ITSP uses telephony protocols over Internet Protocol using VoIP.

The following are few protocols over the IP network for VOIP.

  1. SIP, session initiation protocol.
  2. MGCP, media gateway control protocol.
  3. Megaco
  4. RTP, Real-time protocol
  5. SDP session description protocol
  6. H.323

ITSP infrastructure:


Thanks to the VOIP. As it uses existing IP based infrastructure.  An ITSP used the VoIP for the telephony. It requires basic hardware, a computer server with, and Ethernet cards.  This is in contrast to the legacy telephony(PSTN). Which uses special TDM based hardware.  The ITSP hardware includes high-performance servers, switches Etc.

  • VOIP Servers:
  • SMPP Software:
  • Web portal for plans and creating VoIP accounts.
  • Software for billing.

How to become an ITSP?

There are two main components to become an internet telephony service provider.  First is infrastructure, which is hardware, software, and marketing or sales, team.  Another one is to get connected to the VoIP providers.  Once you are connected many VoIP providers with efficient network and competitive pricing for routes and coverage.  You may then sell better-calling options for international and local calls.