Henning Schulzrinne, Jonathan D. Rosenberg. The Session Initiation Protocol: Providing advanced telephony services across the Internet. Bell Labs Technical Journal, 3(4):144-160, 1998. [doi]
@article{SchulzrinneR98-0,
title = {The Session Initiation Protocol: Providing advanced telephony services across the Internet},
author = {Henning Schulzrinne and Jonathan D. Rosenberg},
year = {1998},
doi = {10.1002/bltj.2133},
url = {https://doi.org/10.1002/bltj.2133},
researchr = {https://researchr.org/publication/SchulzrinneR98-0},
cites = {0},
citedby = {0},
journal = {Bell Labs Technical Journal},
volume = {3},
number = {4},
pages = {144-160},
}