We currently have one Cisco 7921G wireless IP Phone and we would like to use it outside our corporate network. We set up our ASA5510 with phone proxy to our CUCM and the phone can register to the CUCM and gets the extension. However, there are no incoming and outgoing audio when we try to use it. However, if we try to connect it inside the corporate wireless network, it's working fine. Anybody has any idea?
Take a look at your routing. The phone will ring because it can reach (and be reached by) your CUCM server. Once the call is connected the RTP stream is between the endpoints. Make sure your internal phones can reach the external address of the 7921 via the ASA.
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