Glenn W. Parsons, Janusz Maruszak. Calling Line Identification for Voice Mail Messages. RFC, 3939:1-11, December 2004. [doi]
@article{rfc3939, title = {Calling Line Identification for Voice Mail Messages}, author = {Glenn W. Parsons and Janusz Maruszak}, year = {2004}, month = {December}, doi = {10.17487/RFC3939}, url = {https://doi.org/10.17487/RFC3939}, researchr = {https://researchr.org/publication/rfc3939}, cites = {0}, citedby = {0}, journal = {RFC}, volume = {3939}, pages = {1-11}, }