====== sip_raw_info ======
**S → C {type:'sip_raw_info', from:..., format:..., msg:...}**

sip_raw_info – send/receive SIP INFO packets

arguments:
  * from - SIP address INFO packet originates from
  * format - content-type according to [[https://tools.ietf.org/html/rfc6086|SIP INFO specifications]]
  * msg - content according to [[https://tools.ietf.org/html/rfc6086|SIP INFO specifications]]