Systems and methods of providing communications services

An extension communication unit of a first telephony device that receives its native telephony service from a first telephony service provider, wherein the extension communication unit is configured to setup a telephony communication between the first telephony device and a second telephony device through a second telephony system, comprising:

• means for sending a request for communications services from the first telephony device to the second telephony system;
• and
• means for receiving an incoming telephony communication that originates from the second telephony system.

A non-transitory computer readable medium having stored thereon instructions which, when executed by one or more processors of a first telephony device that receives its native telephony service from a first telephony service provider, causes the first telephony device to perform a method of setting up a telephony communication between the first telephony device and a second telephony device through a second telephony system, the method comprising:

• sending a request for communications services from the first telephony device to the second telephony system;
• and
• receiving an incoming telephony communication that originates from the second telephony system.