[Asterisk-IM] Openfire doesn't detect enough Asterisk user

Hi,

I follow instruction to connect Asterisk and Openfire with Asterisk-IM plugin. Everything seem to work fine, except Openfire always misses a device in Device* menu dropdown of Asterisk-IM tab.

For example, I have 4 Asterisk users 1000, 1001, 1002, 1003. Openfire only detects SIP/1000, SIP/1001, SIP/1002 in Device* dropdown menu. I try adding 1 more Asterisk user 1004, restart Asterisk, restart Openfire and Openfire list more 1003 but missing 1004 in menu. One more Asterisk user 1005 and Openfire show 1004 but missing 1005.

What should I do to resolve this issue? Thanks.