Anritsu MT8820C - 7.1.5. Echoback Test

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Registration and IMS Registration 7.1.4.
Perform UE Location Registration, Packet connection and IMS Registration.
1. Connect the UE to the MT8821C.
2. Select the Signaling screen of the MT8821C.
3. Switch on the UE.
4. Wait for packet communication from the mobile terminal to be established.
The MT8821C call processing status changes from IdleRegistrationConnected.
5. The MT8821C IMS status changes from IMS OffIMS Idle within 10 seconds.
Figure 7.1.4-1 Call Processing and IMS Status Screen (MT8821C)
NOTE: When the call processing status has returned to Idle due to unexpected call disconnection (e.g.
End Call key press or Call drop from UE), press the VoLTE End Call key twice to return the IMS
status to Off. Then, please restart the UE.
Echoback Test 7.1.5.
After IMS Registration, perform VoLTE Echoback on the packet connection.
1. Set VoLTE Test Mode to Echo.
Figure 7.1.5-1 VoLTE Test Mode Setting at Call Processing Parameter Screen (MT8821C)
2. Wait for IMS Registration to be completed in 7.1.4.
3. Make a voice call to a random phone number from the UE.
NOTE 1: The MT8821C does not support emergency call numbers like 911, 110, 119 etc.
4. The MT8821C IMS status changes from IMS IdleIMS CallingIMS Connected.
5. Talk into the microphone, the echoback voice can be heard from the UE speaker.
6. End the call from the UE. (Or press VoLTE End Call key in the lower-right corner of the MT8821C Signaling
screen.)
7. The MT8821C IMS status changes from IMS ConnectedIMS Idle.
8. Press VoLTE Start Call in the lower-right corner of the MT8821C Signaling screen.
9. The MT8821C IMS status changes from IMS IdleIMS Ringing, then after answering the phone, the status
changes from IMS RingingIMS Connected.
10. Talk into the microphone: the echoback voice can be heard from the UE speaker.
11. Press VoLTE End Call in the lower-right corner of the MT8821C Signaling screen. (Or end the call from the
UE.)
12. The MT8821C IMS status changes from IMS ConnectedIMS Idle.
NOTE 2: When the call processing status has returned to Idle due to unexpected call disconnection (e.g.
End Call key press or Call drop from UE), press the VoLTE End Call key twice to return the IMS
status to Off. Then, please restart the UE.