1. What is Guanri e-Topup Solution?
Guanri e-Topup solution to prepaid airtime offers telecom carriers and vendors a cost-effective way to deliver their topup service without issuing or distributing topup cards any longer, and provides users an easy and convenient way to top up their mobile phones with public payphones.
Guanri e-Topup solution is applicable to all Guanri coin-operated payphones.
1.1 Topology
Here, we'd like to take payphone W**1 as an example to illustrate the topology of the solution.

Description:
â‘  The user selects the topup amount, inserts coins into payphone W**1, and then inputs the mobile account to be topped up.
â‘¡ The payphone sends the information to the carrier platform over CDMA network.
â‘¢ If topup is successful, the carrier platform sends a PIN to the payphone. If topup is failure, the carrier platform sends an error message to the payphone.  
â‘£ The payphone collects the coins inserted upon receiving the PIN and shows the successful information on the screen. Otherwise, the payphone displays a failure message and returns the coins inserted to the user.