Robert Sparks, Alan B. Johnston, Daniel Petrie. Session Initiation Protocol (SIP) Call Control - Transfer. RFC, 5589:1-58, June 2009. [doi]
@article{rfc5589,
title = {Session Initiation Protocol (SIP) Call Control - Transfer},
author = {Robert Sparks and Alan B. Johnston and Daniel Petrie},
year = {2009},
month = {June},
doi = {10.17487/RFC5589},
url = {https://doi.org/10.17487/RFC5589},
researchr = {https://researchr.org/publication/rfc5589},
cites = {0},
citedby = {0},
journal = {RFC},
volume = {5589},
pages = {1-58},
}