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heeelllooooooo echo
- Thread starter stsguy
- Start date
-> What software are you running on the Mitel?
-> All IP phones are experiencing echo?
-> The echo - found only on outbound calls or even on internal calls?
-> Are you running data and voice on the same network?
-> how many sets are in use before echo is heard... maybe you do not have a sufficient DSP resources?
-> what testing have you done so far?
More specific the answer - the more we can help you.
-> All IP phones are experiencing echo?
-> The echo - found only on outbound calls or even on internal calls?
-> Are you running data and voice on the same network?
-> how many sets are in use before echo is heard... maybe you do not have a sufficient DSP resources?
-> what testing have you done so far?
More specific the answer - the more we can help you.
- Thread starter
- #3
running 5.0 software. all ip's are getting echo.echo on co calls only. running voice and data on the same network with 2 vlans. 20 ip phones on the system,not sure how many is in use when this occurs.no testing so far. going to customer site tommorow to test
From the Technicians Handbook:
Measuring LS Trunks
Line Quality Measures the loss level and impulse response of the trunk and recommends Length and Impedance settings to
program in Form 13 (Audio Configuration Table subform). If Length and Impedance are set to AUTO in Form 13, the recommended settings are programmed automatically when the test is run.
The test results are posted to the maintenance and software logs, and e-mailed to the address specified in Form 52 (Email).
Line Length Settings: Short, Long, and Extra Long.
The Extra Long setting is only valid with AMB/AOB LS trunks. It provides additional gain for signals transmitted from the CO to the ICP but not for signals transmitted from the ICP to the CO.
Impedance Settings: 600 Ohm, Complex, DSL, and Impedance A.[/color red]
Impedance A can be used to match the controller to LS lines that have loading coils. Impedance B, C, and D are listed but not yet available for use. If selected, the system defaults to 600 Ohm.
Running the Echo Test
To run the Echo test:
1. Run the Line Quality test and program Length and Impedance for the trunk in Form 13 (Audio Configuration Table subform)
2. Log in the Maintenance Terminal (direct or Telnet) and begin a Maintenance session.
3. Use the DIAGNOSTICS > BUSY-OUT function to take the trunk out of service.
4. Press
DIAGNOSTICS
LS_MEASURE
select ECHO_TEST (for one trunk) or BATCH_ECHO (for all trunks) Respond to the prompts to run the test.
If the test is successful, the results are sent to the logs and emailed to the address specified in Form 52 (Email).
5. Forward the test results to Mitel Product Support.
Echo between LS Trunks and IP Phones:
Measure the loss level and impedance for LS trunks connected
to onboard ASUs (See “Diagnostic Function Commands” on page 288). If necessary, update the Options subform of Form 13 with matching settings.
-> In Form 4 - Option 82, is that enabled?
Measuring LS Trunks
Line Quality Measures the loss level and impulse response of the trunk and recommends Length and Impedance settings to
program in Form 13 (Audio Configuration Table subform). If Length and Impedance are set to AUTO in Form 13, the recommended settings are programmed automatically when the test is run.
The test results are posted to the maintenance and software logs, and e-mailed to the address specified in Form 52 (Email).
Line Length Settings: Short, Long, and Extra Long.
The Extra Long setting is only valid with AMB/AOB LS trunks. It provides additional gain for signals transmitted from the CO to the ICP but not for signals transmitted from the ICP to the CO.
Impedance Settings: 600 Ohm, Complex, DSL, and Impedance A.[/color red]
Impedance A can be used to match the controller to LS lines that have loading coils. Impedance B, C, and D are listed but not yet available for use. If selected, the system defaults to 600 Ohm.
Running the Echo Test
To run the Echo test:
1. Run the Line Quality test and program Length and Impedance for the trunk in Form 13 (Audio Configuration Table subform)
2. Log in the Maintenance Terminal (direct or Telnet) and begin a Maintenance session.
3. Use the DIAGNOSTICS > BUSY-OUT function to take the trunk out of service.
4. Press
DIAGNOSTICS
LS_MEASURE
select ECHO_TEST (for one trunk) or BATCH_ECHO (for all trunks) Respond to the prompts to run the test.
If the test is successful, the results are sent to the logs and emailed to the address specified in Form 52 (Email).
5. Forward the test results to Mitel Product Support.
Echo between LS Trunks and IP Phones:
Measure the loss level and impedance for LS trunks connected
to onboard ASUs (See “Diagnostic Function Commands” on page 288). If necessary, update the Options subform of Form 13 with matching settings.
-> In Form 4 - Option 82, is that enabled?
- Thread starter
- #5
IrwinMFletcher
Programmer
If by set to set you mean IP set to IP set (and not via a TDM trunk), then it's acoustic echo only. Most likely the far end was hands-free.
- Thread starter
- #8
IrwinMFletcher
Programmer
The Rx gain of the IP handset has nothing to do with echo. Tx can, but not Rx. Echo is caused by an impedance mismatch at the 4-2 wire hybrid within the LS circuit. Running the LMT will create a filter that will better match that impedance. Have you run the LMT? What were the results?
IrwinMFletcher
Programmer
Sorry, I wasn't implying that you can change the Tx gain (maybe you can, maybe you can't, don't know). I was just stating that if anything it would be the Tx gain, not the Rx.
- Status