In the Other APIs and protocols chapter, under Using SIP2 (https://koha-community.org/manual/latest/en/html/apis_protocols.html#using-sip2) there is a link to 3M documentation for SIP2. This link is broken. <mediatype> is a three numerical character long value. For a list of the values go to: http://multimedia.3m.com/mws/media/355361O/sip2-protocol.pdf
Just noticed it is there twice more <feetype> is a two numerical character value which is between 01 and 99. To see a list of fee type values go to http://multimedia.3m.com/mws/media/355361O/sip2-protocol.pdf Useful links on SIP2 commands: http://multimedia.3m.com/mws/media/355361O/sip2-protocol.pdf