Calling an unready terminal

A method to establish a call between a caller terminal and a called terminal, the method comprising:

• receiving, by the called terminal, a call establishment request from the caller terminal to establish a call with the called terminal, the call establishment request indicating an initiation of the establishment of the call at the caller terminal, wherein an application to accept the call is not installed on the called terminal when the called terminal receives the call establishment request;
• in response to the receiving the call establishment request:
• presenting a prompt that requests whether a user wishes to answer the call request, and to allow installing the application in order to accept the call,
• based on selection of the prompt, installing the application on the called terminal, and
• sending, via the installed application, a reverse call establishment request for the call to the caller terminal, in response to a completion of the installing of the application and the reception of the call establishment request from the caller terminal, the reverse call establishment request configured to cause the caller terminal to accept the reverse call establishment request on behalf of the caller, wherein the installation of the application on the called terminal occurs during the establishment of the call at the caller terminal;
• and
• receiving a call acceptance response to establish the call, the call acceptance response indicating a completion of the establishment of the call at the caller terminal.

A user terminal comprising:

• one or more hardware processors;
• and
• a memory comprising instructions, executable by the one or more hardware processors, to configure the user terminal to establish a call between a caller terminal and the user terminal where a client application to accept the call is not installed on the user terminal when the user terminal receiving a call establishment request, by performing operations including:
• receiving, by the user terminal, the call establishment request to establish the call between the caller terminal and the user terminal and indicating an initiation of the establishment of the call at the caller terminal;
• in response to receiving the call establishment request:
• presenting a single prompt that requests whether a user wishes to answer the call request, and to allow installing the client application,
• based on selection of the single prompt, installing the client application on the user terminal,
• sending, via the installed client application, a reverse call establishment request to the caller terminal in response to a completion of the installing of the client application and the reception of the call establishment request from the caller terminal the reverse call establishment request configured to cause the caller terminal to accept the reverse call establishment request, wherein the installation of the client application on the user terminal occurs during the establishment of the call at the caller terminal, and
• receiving a call acceptance response to establish the call between the user terminal and the caller terminal over a packet-switched network, the call acceptance response indicating a completion of the establishment of the call at the caller terminal.

A system comprising:

• one or more hardware processors;
• and
• one or more computer-readable storage media storing instructions that are executable by the one or more hardware processors to perform operations to establish a call between a caller terminal and a called terminal where a client application to accept the call is not installed on the called terminal when the called terminal receives a call establishment request, the operations including:
• receiving, at the called terminal, the call establishment request initiated by a client application executed by a caller terminal to establish a call between the caller terminal and a called terminal, the call establishment request indicating an initiation of the establishment of the call at the caller terminal;
• in response to receiving the call establishment request, performing operations at the called terminal including:
• installing the client application on the called terminal,
• sending, automatically and independent of user input at the called terminal, and via the client application executing by the called terminal, a reverse call establishment request to the caller terminal in response to a completion of the installing of the client application and the reception of the call establishment request from the caller terminal, the reverse call establishment request configured to cause the caller terminal to accept the reverse call establishment request on behalf of the caller, wherein the installation of the client application on the called terminal occurs during the establishment of the call at the caller terminal and
• receiving a call acceptance response to establish the call between the caller terminal and the called terminal, the call acceptance response indicating a completion of the establishment of the call at the caller terminal.

A method to establish a call between a caller terminal and a called terminal, the method comprising:

• receiving, by the called terminal, a call establishment request initiated by the client application executed by the caller terminal to establish the call between the caller terminal and the called terminal, wherein the client application to accept the call is not installed on the called terminal when the called terminal receives the call establishment request;
• in response to receiving the call establishment request at the called terminal, performing operations at the called terminal including:
• installing the client application on the called terminal,
• sending, automatically and independent of user input at the called terminal, and via the client application executing by the called terminal, a reverse call establishment request to the caller terminal in response to a completion of the installing of the client application on the called terminal and the reception of the call establishment request from the caller terminal, the reverse call establishment request configured to cause the caller terminal to accept the reverse call establishment request on behalf of the caller, wherein the installation of the client application on the called terminal occurs during the establishment of the call at the caller terminal, and
• receiving a call acceptance response to complete establishment of the call between the caller terminal and the called terminal, the call acceptance response indicating the completion of the establishment of the call at the caller terminal.