I presume "automaton" is simply an error - a misspelling.
You can look in the iana registry for all the defined feature tags.

On 4/29/14 3:27 AM, SIP Learner wrote:
Hi, guys!


I am reading RFC5359 for SIP services examples, some of the message examples 
contain a Contact header parameter like the following:


Contact: <sips:mu...@server.example.com>;automaton
;+sip.byeless;+sip.rendering="no"



FRC5359 states that the automaton feature tag is defined in RFC3840, but 
RFC3840 actually defined sip.automata instead of automaon.


What is the difference between automaton and sip.automata anyway? Are they 
equivalent or are they different?


Thanks a lot!
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