%% You should probably cite rfc7463 instead of this I-D.
@techreport{ietf-bliss-shared-appearances-09,
    number =    {draft-ietf-bliss-shared-appearances-09},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-bliss-shared-appearances/09/},
    author =    {Alan Johnston and Mohsen Soroushnejad and Venkatesh Venkataramanan},
    title =     {{Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR)}},
    pagetotal = 70,
    year =      2011,
    month =     dec,
    day =       30,
    abstract =  {This document describes the requirements and implementation of a group telephony feature commonly known as Bridged Line Appearance (BLA) or Multiple Line Appearance (MLA), or Shared Call/Line Appearance (SCA). When implemented using the Session Initiation Protocol (SIP), it is referred to as shared appearances of an Address of Record (AOR) since SIP does not have the concept of lines. This feature is commonly offered in IP Centrex services and IP-PBX offerings and is likely to be implemented on SIP IP telephones and SIP feature servers used in a business environment. This feature allows several user agents (UAs) to share a common AOR, learn about calls placed and received by other UAs in the group, and pick up or join calls within the group. This document discusses use cases, lists requirements and defines extensions to implement this feature.},
}