Implementation of Extended Automatic Callback Service in SIP-based VoIP System


The KIPS Transactions:PartC, Vol. 12, No. 2, pp. 251-260, Apr. 2005
10.3745/KIPSTC.2005.12.2.251,   PDF Download:

Abstract

On the internet phone or PSTN(Public Switched Telephone Network), the automatic callback is an useful service in the case of busy state when one user calls the other. By using this service, automatic redial is possible when the other party hangs up. However, in the basic automatic callback service, the user who wants callback should wait until the other party hangs up even in the case of emergency. Therefore in this paper, to solve this problem we have extended CPL(Call Processing Language) and, within user system, we have included and linked this extended CPL, processing module and dialog event package which processes SIP INVITE initiated dialog state informations. We have implemented this system for being used in SIP(session Initiation Protocol)-based VoIP(Voice over IP) system.


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Cite this article
[IEEE Style]
H. G. Jo, K. S. Lee, C. S. Jang, "Implementation of Extended Automatic Callback Service in SIP-based VoIP System," The KIPS Transactions:PartC, vol. 12, no. 2, pp. 251-260, 2005. DOI: 10.3745/KIPSTC.2005.12.2.251.

[ACM Style]
Hyun Gyu Jo, Ky Soo Lee, and Choon Seo Jang. 2005. Implementation of Extended Automatic Callback Service in SIP-based VoIP System. The KIPS Transactions:PartC, 12, 2, (2005), 251-260. DOI: 10.3745/KIPSTC.2005.12.2.251.