Need help please ! dir 601 n150 router

hi everyone i have a problem with my wireless router, when i use the lan cable from directly from the modem the freephone work perfectly but if I use my wireless connection with
the router there no connection with the modem , the test connection with the freephone software say that everything is ok but i can't call nobody .

Also I can't access to my voicemail
the router there no connection with the modem , the test connection with the freephone software say that everything is ok but i can't call nobody .


Also I can't access to my voicemail