%% You should probably cite draft-ietf-payload-tetra instead of this I-D.
@techreport{df-stecker-expertenforum-payload-tetra-00,
    number =    {draft-df-stecker-expertenforum-payload-tetra-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-df-stecker-expertenforum-payload-tetra/00/},
    author =    {Andreas Reisenbauer and Udo Brandhuber and Joachim Hagedorn and Klaus-Peter Höhnsch and Stefan Wenk},
    title =     {{RTP Payload Format for the TETRA Audio Codec}},
    pagetotal = 14,
    year =      2018,
    month =     jan,
    day =       9,
    abstract =  {This document specifies a Real-time Transport Protocol (RTP) payload format to be used for TETRA encoded speech signals. The payload format is designed to be able to interoperate with existing TETRA transport formats on non-IP networks. This version of the document does not specify a file format for transport of TETRA speech data in storage mode applications such as email as would be required by the IETF. A media type registration is included, specifying the use of the RTP payload format and the storage format.},
}