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Applying Congestion Pricing at Access Points for Voice and Data Traffic
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shih, Jimmy S. |
| Copyright Year | 2003 |
| Abstract | ion allowed us to reliably add and test new functionalities. This deployment experience taught us that it is not easy to convince users to use their computers instead of phones. Based on surveys, users stated that they stop using the 57 service because they need to use a headphone, run NetMeeting, and adjust sound before they can make a call. Users indicated that they are hesitant to use the service for receiving incoming calls because they need to give out new phone numbers. Finally, with location update, users found that it is hard to remember to update their computer locations whenever they switch computers. 4.5 Second Prototype 4.5.1 Requirements The goal of the second prototype was to attract a larger user community. We decided to target the undergraduates in our department because they only have access to pay phones when they are in school. We believed that it would be easier to build a user community for those who do not have easy access to phones. Based on the lessons learned in the first prototype (and to attract and retain more users), we decided to support the following features to make the service more usable. For outgoing calls, we wanted to allow users to use any computer in the undergraduate computer cluster. After logging in with a password, they can enter either phone numbers or user IDs of the people they want to call. To increase incoming calls, we wanted to forward calls to users’ computers if they are logged on, and forward them to phone numbers chosen by users otherwise. Using logins to indicate where the users are, we eliminated the issue of requiring users to dynamically specify which computers for receiving their calls. Forwarding incoming calls to phone numbers when users are not logged on saves us the work of implementing a voice mail service. During a call, we would like users to be able to send DTMF tones from their computers to check their answering machines for messages. Furthermore, we 7 DTMF tones are touch tones on phones that allow users to dial numbers and send & receive control tones during a call. 58 would like to provide users on their computers with real-time pricing and accounting information. With these features, we hoped that the undergraduates in our department would find the service useful. 4.5.2 Architecture Our architecture now consists of a web page, a web server, a proxy, and the Motorola gateway (see Figure 4.10). We upgraded the Motorola gateway with a Primary Rate ISDN line that can support 23 simultaneous calls between the Internet and the PSTN. For incoming calls, we setup a hunt group for the 23 lines so that callers on the PSTN only need to dial one phone number to locate an available line. For the user interface, since NetMeeting does not support text display or DTMF, we decided to use a web page (see Figure 4.11) to provide users with better and more flexible inputs and outputs, like real-time prices and DTMF. To simplify development, we reused NetMeeting as the H.323 client by incorporating it inside the web page. Primary Rate ISDN Line (23 Simultaneous Calls) Ethernet H.323 Gateway (Motorola Vanguard 6560) PSTN Phone Internet PSTN Web Page H.323 Client (Microsoft NetMeeting) Java Applet Control Control & Data Web Server |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://digitalassets.lib.berkeley.edu/techreports/ucb/text/CSD-03-1235.ps |
| Alternate Webpage(s) | http://sahara.cs.berkeley.edu/papers/JS03.pdf |
| Alternate Webpage(s) | http://digitalassets.lib.berkeley.edu/techreports/ucb/text/CSD-03-1235.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
