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Once participants joined it is trivial to vote for issues.
Collaborate with remote participants
The great feature of Agile Poker for JIRA is that all task board changes will be instantly visible through your JIRA. So if anyone is in another location he will not miss anything and he will not have to refresh the board. The plugin will handle all the communication and user interface updates.
You still need to use another tool for voice communication though - please use audio / video communication tool (HipChat, Skype, Webex) that's suitable for you.