The Session Initiation Protocol (SIP) Refer Method
Robert Sparks · 2003
The Session Initiation Protocol (SIP) Refer Method Status of this MemoThis document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol.Distribution of this memo is unlimited.