Troubleshooting echo

Question

1751v Router w/2 2port DID VIC's
I'm attempting to troubleshoot the sporadic voice issues one of my remote offices are having, but I've read so many support docs that I?ve got myself confused. The most common issue reported is echo. The people on the IP side of the legs are hearing the echo, not the outside (analog).
My voice ports are setup as follows:
voice-port 1/0
input gain -3
echo-cancel coverage 48
no vad
no comfort-noise
timing dialout-delay 300
I've been reading through an impedance troubleshooting doc and I'm concerned about the ERL levels that are being reported.
I make a test call via a typical outside analog line to a DID number in that office. then, I issue a test tone sweep on that particular port and here's what I see:
A-1751#test voice port 1/1 inject-tone network sweep 200 0 0
Freq (hz), ERL (dB), TX Power (dBm), RX Power (dBm)
104 -79 -82 -3
304 -79 -82 -3
504 -79 -82 -3
704 -79 -82 -3
904 -79 -82 -3
1104 -79 -82 -3
1304 -79 -82 -3
1504 -79 -82 -3
1704 -79 -82 -3
1904 -79 -82 -3
2104 -79 -82 -3
2304 -79 -82 -3
2504 -79 -82 -3
2704 -79 -82 -3
2904 -79 -82 -3
3104 -79 -82 -3
3304 -79 -82 -3
3404 -79 -82 -3
Those ERL values aren't even close to what the troubleshooting docs recommend. I've tried all 5 impedance settings as well as changing the input gain, output attenuation, and the echo-coverage to try and eliminate the echo problems..
Do those ERL levels (-79) look normal to anyone?? Any advice on what I should do next to get to the bottom of this echo problem?
(Just realized I posted this in the wrong Topic, Sorry!)

Answer 1

I've initiated the test tone from the 7960 and was able to replicate near or exactly the same erl that I have seen in other docs. I had to call from one 7960 to another 7960 via the pstn and once the call is established initiate the test tone from both phones.
Press the Settings button on the IP phone to enter the Settings menu in order to enable the tone
generator.
This enables the Tone softkey for as long as this phone is registered to Cisco CallManager.
1.
Press **##**3 on the Cisco IP Phone 7940 or 7960 keypad while the phone is not on a call. When
you go to Option 5 "STATUS", you should see more debug information (for example, Stack
Statistics, and Debug Display).
Note: From Load #P0030301ESP5, you need to unlock the phone first, then you can press **##**3.
You need to be careful because if you press **#** consecutively, you reset the phone (because of
the **#** sequence).
This enables the Tone softkey for as long as this phone is registered to Cisco CallManager.
2.
Place a call to the source phone with the echo problem.
Once the call is established, press the "i or ?" button twice. This brings up the statistics for the call.
Note: If the **##**3 key sequence works, you should have a Tone softkey available. Press the Tone
softkey and the phone begins to generate a 1004 Hz tone at -15 dB. The only way to stop the tone is
to end the call.