[sip protocol] what's the "glare" condition?

dracularking 2008-12-26
If an agent receives an offer after having sent one, but
   before receiving an answer to it, this is considered a "glare"
   condition.

dracularking 2008-12-26
The term glare was originally used in circuit switched
      telecommunications networks to describe the condition where two
      switches both attempt to seize the same available circuit on the
      same trunk at the same time.  Here, it means both agents have
      attempted to send an updated offer at the same time.
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