Telephone Protocols - http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=05/11246.050203&ELEMENT_SET=DECL

http://www.wipo.int/cgi-pct/guest/getbykey5?KEY=05/11246.050203&ELEMENT_SET=DECL
SYSTEM AND METHOD FOR PROXY GATEKEEPER IN H. ... Exemplary IP telephone protocols include the ITU's Recommendation H ...