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Voip telefon is ringing but no voice on both sides

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 dosnĀ“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?

hopefully
peter
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Peterfrey
Asked:
Peterfrey
1 Solution
 
z_kweckaCommented:
if your SIP provider provides you with a STUN server, then configure your phone to use this.
Who is SIP?
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PeterfreyAuthor Commented:
i have found the problem:

the only one reason for this failure was the settings : inspect SIP.
after i have disabled this settings it works. without nat settings or other access lists.

thanks for your quick help.
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