Aastra 6755i no audio in or out

Discussion in '3CX Phone System - General' started by ellenboa, Apr 20, 2010.

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  1. ellenboa

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    I have configured my Aastra 6755i IP phone to use my 3CX server. It is registering, i can establish a phone call, but no audio works. Not inbound nor outbound.

    Thanks in advance for any help.
     
  2. mfm

    mfm Active Member

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    Hi,

    Both audio streams not working might lead me to think its a stun issue. Also these phones are not supported I recommend you use on of the supported phones. Also you might try using the tunnel and see how you go.
     
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  3. comresource

    comresource Member

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    Is this an external extension or on the local LAN? If local, make sure the firewall on the 3CX box is not blocking RTP packets.
     
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