Semantic Warnings and Feature Interaction in Call Processing Language on Internet Telephony

The Call Processing Language (CPL in short, RFC2824) is an XML-based language, which provides a flexible mean to create end-user services in the Internet Telephony (VoIP). However, the service description by non-experts does not always guarantee reliable services, thus, could be a cause of system faults. This paper first proposes six classes of the semantic warnings within the CPL scripts. For a given CPL script, the semantic warnings identify the sources of ambiguities, redundancies and inconsistencies, even though the script is syntactically well-formed with respect to the Document Type Definition. Next, we address the problem of Feature Interaction (FI, in short) between multiple CPL scripts, which is a kind of inconsistent conflict between services. We characterize the FIs as the semantic warnings over the multiple CPL scripts. Then, we propose a new FI detection method to combine the multiple CPL scripts and to detect script-to-script interactions. We also discuss architectur...

• Type: Conference
• Year: 2003
• Where: SAINT
• Authors: Masahide Nakamura, Pattara Leelaprute, Ken-ichi Matsumoto, Tohru Kikuno
• Keywords: Cpl Scripts, Internet Technology, Multiple Cpl Scripts, SAINT 2003, Semantic Warnings