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An Efficient Transaction Cancellation Mechanism of Session Initiation Protocol
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- Authors
- Jae Cheon Han, Shin Gak Kang
- Issue Date
- 2007-07
- Citation
- International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC) 2007, pp.1316-1317
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- SIP is a transactional protocol. There are two types of transactions depending on the method of the request: INVITE transaction and NON-INVITE transaction. RFC3261 describes state machines for SIP transactions. Unfortunately, there is a hole in the one of the state machines. When UAC cancels INVITE transaction, a race condition might be occurred. In that case, UAC believes the session is cancelled, but UAS believes the session is immediately established. In this paper, we will describe that why the problem break out and how the problem can be overcome.