Symptom:
When Jabber calls PSTN phone over Cisco Expressway, and the call is declined by the callee, there will be no voice hint f played by STN gateway for call failure. Instead Jabber will hear the calling tone always. The issue doesn't exist if Jabber is registered in corp network.

Conditions:
make a call from Jabber to a PSTN phone number, and the PSTN phone declines the call