Alan B. Johnston, Orit Levin. Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents. RFC, 4579:1-43, August 2006. [doi]
@article{rfc4579,
title = {Session Initiation Protocol (SIP) Call Control - Conferencing for User Agents},
author = {Alan B. Johnston and Orit Levin},
year = {2006},
month = {August},
doi = {10.17487/RFC4579},
url = {https://doi.org/10.17487/RFC4579},
researchr = {https://researchr.org/publication/rfc4579},
cites = {0},
citedby = {0},
journal = {RFC},
volume = {4579},
pages = {1-43},
}