標題: | A callback mechanism for Private Telecommunications Networks |
作者: | Chang, Ming-Feng Lu, Fang-Sun Chia, Chung-Yung 資訊工程學系 Department of Computer Science |
關鍵字: | VoIP;PSTN;Callback;VoIP gateway |
公開日期: | 15-Mar-2010 |
摘要: | Private Telecommunications Networks (PTNs), such as enterprise telephony and Voice over IP (VoIP), have been widely deployed. A common limitation of PTNs is that PTN users are usually not assigned with Public Switched Telephone Network (PSTN) EA 64 numbers. A PTN user is usually identified by an extension number or a URI (universal resource identifier). When a PTN user initiates a call to a PSTN user, it is not possible to use the PTN calling party's identifier as the caller ID; instead, an E.164 number of the PBX or VoIP gateway is used. As a result, the PSTN called party cannot use the caller ID received to call back to the PTN calling party later, if the PTN user's extension number or URI is unknown. This paper proposes a callback table approach to solve this problem. We describe how the call-out information is stored into and retrieved from a callback table maintained in the PBXs; or VoIP gateways to provide callback service. Numeric analysis has been performed to evaluate the performance of this callback solution. The numeric results indicate that the callback method provides a satisfactory solution when there is sufficient voice traffic served by a VoIP gateway. (C) 2009 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.comcom.2009.10.020 http://hdl.handle.net/11536/5726 |
ISSN: | 0140-3664 |
DOI: | 10.1016/j.comcom.2009.10.020 |
期刊: | COMPUTER COMMUNICATIONS |
Volume: | 33 |
Issue: | 5 |
起始頁: | 583 |
結束頁: | 588 |
Appears in Collections: | Articles |
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