Why in MPE 2, some users when trying to join an audio conf., they are asked for their IDs and passwords while some are not?

A meeting is established, and when ionternal users use their IP phone to attend the audio conference call, some are asked for their IDs and passwords and some are asked to enter the meeting ID directly.
Why is it like that? We need all the users to be able to enter the meeting ID directly without needing to verify themselves, thanks.

Agree with hirantha.
Can you call from internal desktop client to external desktop client?
Please check that first.
If not, check the required port requirement for Lync Edge Server:
http://technet.microsoft.com/en-us/library/gg398798.aspx
Lisa Zheng
TechNet Community Support

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