On-network routing for inter-carrier calling

A system comprising:

• a first device associated with a first public switched telephone network (PSTN) carrier;
• a second device associated with a second PSTN carrier;
• and
• a software platform configured to:
• receive call data from the first device;
• determine that a destination of the call data is the second device;
• determine that the first device and the second device are associated with the software platform via registrations to a same multi-tenant unified communications as a service (UCaaS) customer account;
• determine on-network routing based on device registration and carrier support flags;
• transmit a first portion of the call data to the first PSTN carrier and the second PSTN carrier, wherein the first portion of the call data includes call record information;
• and
• transmit a second portion of the call data to the second device, wherein the second portion of the call data includes media and signaling information.

A non-transitory computer-readable medium comprising stored instructions that when executed by a processor, cause the processor to perform operations comprising:

• receiving call data from a first device associated with a first public switched telephone network (PSTN) carrier and a software platform;
• determining that a destination of the call data is a second device associated with a second PSTN carrier and the software platform;
• and
• based on the first device and the second device both being associated with the software platform via registrations to a same multi-tenant unified communications as a service (UCaaS) customer account:
• determining on-network routing based on device registration and carrier support flags;
• transmitting, from the software platform, a first portion of the call data to the first PSTN carrier and the second PSTN carrier, wherein the first portion of the call data includes call record information;
• and
• transmitting, from the software platform, a second portion of the call data to the second device, wherein the second portion of the call data includes media and signaling information.