[cisco-voip] what trafic to ip comunicator uses

[AA]

 we have cm 4.1.3 .  and we are testing ip comunicators. we need to open up our routers to allow 2 way voice.  its just one way currently because of acl in our router.  just need to now what type of trafic is needed to pass thru 
James Grace 
System Engineer /Professional Srvc.
MCSE MCSA MCDBA CCNA CCNP CQS

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