Symptom:
No available line to play the message during VVM stress test

Conditions:
No available line to play the message during VVM stress test

Network Impairment(Network to Phone):
Drop Rate: 10%
Delay: 100ms
Duplicated Packets: 5%
Altered Packets:  5%
Broadcast messages to MAC address FF:FF:FF:FF:FF:FF and IP address 255.255.255.255 and destination port 80. 10 packets per seconds.

Steps:
1. Phone A has a single line on the 1st line and shared lines on line 2 through 5. Phone A in encrypted mode.
2. The remote sides of the shared lines make calls to other phones. Call burst rate is about 12 calls per minute. The shared lines on phone A shows the states of the remote sides. 
3. Place a call to voice mail, input the password. After 5 seconds, end the call.
    Invoke the VVM application, input the password, play the first Message. Exit the VVM application.
4. Repeat step 3.