Why doesn the user see the Resume key on the desk phone after hanging up the cellular phone for desk pickup?

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Why doesn the user see the Resume key on the desk phone after hanging up the cellular phone for desk pickup?

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A. The problem could be due to the cellular phone service provider. When disconnecting a call for the cellular phone, some cellular providers play a tone (similar to a busy tone) instead of sending a disconnect signal to Cisco Unified CallManager. Cisco Unified CallManager cannot detect the call hangup; the other party hangs upon hearing the tone. Because the call has not been disconnected immediately, the desk pickup feature cannot work.

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