Voip telefon is ringing but no voice on both sides
Posted on 2008-10-26
i have setup a cisco asa 5505 for real simpley network. if i connect a voip telefon into the network,
i get all informations from IP-telephon center. i can call the phone but if i pick up, on the caller side i can here the ringing but no pickup and no voice.
i have configured a nat rule, after this it works.
BUT after a restart of the asa, it dosn´t work any more. if i delete the nat entry and restart the asa again, the telephon can connect to the ip-telephon center and receive the configuration.
for mit thats not realy a solution.
have any body an idea?