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Problem with IP phone over VPN

          ---------------                                   ---------------

         |   UC520   | ------------------------ |     861     |

          ---------------                                   ---------------

                 |                                                  |

              LAN                                             LAN

Scenario:

UC520 box is at HQ and serving as a EZVPN server and 861 at branch as a EZVPN client. There is no problem with VPN i can communicate with HQ network. My ip phone get registered but facing these problems.

1) Dialling out and in OK

2) Connects OK after picking up

3) NO sound either way

4) Cannot end call from this side. End call button does not work

5) When other end hangs up - message "UCM down, features disabled". Then phone registers again.

Identical symptoms for both softphone and 7941.

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