Aki Niemi, Dean Willis. An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification. RFC, 5839:1-25, May 2010. [doi]
@article{rfc5839,
title = {An Extension to Session Initiation Protocol (SIP) Events for Conditional Event Notification},
author = {Aki Niemi and Dean Willis},
year = {2010},
month = {May},
doi = {10.17487/RFC5839},
url = {https://doi.org/10.17487/RFC5839},
researchr = {https://researchr.org/publication/rfc5839},
cites = {0},
citedby = {0},
journal = {RFC},
volume = {5839},
pages = {1-25},
}