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With IP Phone 7940 or 7960 with phone load version 6.0(5) and in authenticated and encrypted security modes in CallManager 3.1.x and 4.0, the user encounters an intermittent delay when resuming a parked call or a call placed on hold. User hears no audio

Core Issue

The phone status is connected as soon as you press the resume Softkey, but audio can not be heard for fiveseconds. This is happening with phones in authenticated and encrypted security modes about 20 percent of the time.

This occurs for both PSTN based calls, as well as internal IP phone-to-IP phone calls.


This issue is documented in Cisco bug ID CSCef07550.

The fix for this issue is available in these IP phone load versions:


  • 7.0.2 (phone load P0030600T017) for Cisco CallManager version 4.1
  • 7.1(1) for Cisco CallManager version 3.1.x and later versions.

Note: P0030600T017 is an engineering special phone load and is based on P00306000500 (phone load version:6.0(5).

To download the latest versions of IP phone load, refer to Software Download: Cisco IP Phone FW 7900 Series (NON SIP).

For a workaround, consider these alternatives:

  • Revert to IP phone load version 6.0.4.
  • Use G711 codec if the Cisco CallManager version is 4.0.2a es10.