One-Sided Fade Outs on IPO4 5

[573dawn]

Hi All, new thread for a not-so-new problem. I'm sure some of you are well aware of my dropped call issues. Afte changes made today, we are getting fewer drops, though not eliminated. However, we have this new problem: The call will "fade out" while you are on the phone. It doesn't drop, but one or the other party will get silence, while the remainign party can still hear the opposite party. This lasts a few seconds and then both parties can hear each other again.

In Monitor I can see:

********** contact lost with 192.168.3.180 at 14:13:28 6/7/2007 - reselect = 2178 **********
******************************************************************


********** SysMonitor v6.0 (5) **********

********** contact made with 192.168.3.180 at 14:13:28 6/7/2007 **********

********** System (192.168.3.180) has been up and running for 2days, 22hrs, 34mins and 31secs(254071121mS) **********

Along with the occasional dopped packets. But these calls DON'T disconnect, just fade in and out.

 

[kwing112000]

What type of phones is it.

 

[573dawn]

5410s and one 5420 at the location having the most trouble, this is on IP400 running 4.0.5 across PTP T1.

 

[Gibsonic]

turn off echo cancellation.

 

[Escorthosis]

Also disable all the AGC settings under the options on every 5410 and 5420 handset.
I don't know if this is wat Gibsonic was referring to, but it the trick for some of our installs.

 

[573dawn]

Gibsonic and Escorthosis, sorry I'm such a dummy on this, but where do I find these? I looked in Help and I am still lost

Thanks, Dawn

 

[573dawn]

Ok, I find echo cancellation on my analog trunks, but not on the PRI or IP trunks, am I missing something. On the analog, it is set to 16ms. We have also had alot of echo problems, but this is worse, so should I turn it off on the analog trunks? Will this help overall? Or am I just missing something?

Thanks, Dawn

 

[573dawn]

Also, what does AGC do? I see it is enabled on my phone, meaning it is probably enabled on all of them. Obviosuly this has to be done AT the handset? or can it be done somewhere in Manager?

Sorry I'm such a newbie at this, I kind of had it thrown at me <g>

Thanks, Dawn

 

[Gibsonic]

sorry, im thinking of a couple of things at once right now.
...but what i was saying about the echo cancellation could still be applicable but it's not a setting on the IPO, it would be on a cisco router that created the link for the P2P.

there is a non-linear setting in the router that goes above and beyond standard echo cancellation and can save you bandwidth but can also cut off voice when the voice of the caller trails off a bit like towards the end of a sentence or conversation.


the Automatic Gain Control (AGC)on the phone does what the name implies, it automatically tries to adjust the gain/volume of the call. Definitely something worth trying.

 

[573dawn]

Ok, I have instructed all users to turn off the AGC on their phones, I will be at my most troubled location tomorrow and will verify that it has been done.

Gibsonic, can you please elaborate on the cisco? I have 3 PTPs out to my 3 remote sites, all are on cisco 1720/1721s. They are not configured for anything special, no traffic shaping, no policy-maps, very little in the way of routes because they don't need many routes (and they're all static anyway), BUT, a couple that were in place before I worked here are configured for weighted-fair queuing, while my big trouble location is set to fifo.

What specifically whould I look for in the config? I have more experience with cisco than I do with avaya, and have full rights to configure. I have never had to confighre a cisco with attention to voice telephony before now, either, but my utilization is very low, usually unser 5%, and few errors.

Thanks, Dawn

 

[Gibsonic]

what you are looking for in your cisco routers is the command

non-linear

in your voice-port configuration

NLP (non-linear processing) is enabled by default.

from cisco...

"#

non-linear—The function enabled by the non-linear command is also known as residual echo suppression. This command effectively creates a half-duplex voice path. If voice is present on the inbound path, then there is no signal on the outbound path. This command is associated with the echo canceller operation. The echo-cancel enable command must be enabled for the non-linear command to take effect. Use the non-linear command to shut off any signal if near-end speech is not detected.

Enabling the non-linear command normally improves performance. However, some users encounter truncation of consonants at the ends of sentences when this command is enabled. This occurs when one person is speaking and the other person starts to speak before the first person finishes. Because the nonlinear cancellation allows speech in one direction only, it must switch directions on the fly. This might clip the end of the sentence spoken by the first person or the beginning of the sentence spoken by the second person.

 

[573dawn]

Gibsonic, I have no voice-port configuration. I don't even see anything related to this on my ciscos. Is it something new? My 1720/21s are running 12.0 to 12.3 CIOS, not exactly up to date, and not exactly designed for VOIP anyway, but if you have any configuration suggestions, I will be happy to post my current running configs.

I am headed home right now, but will check back once there.

Thanks, Dawn

 

[Gibsonic]

hrm...well...that was just something i ran across the other day on the cisco router thing. It was more for voice circuits actually terminating into the router, not for voice traveling over a data circuit.

so that points back to the ip office. in your IP trunk do you have silence supression turned on?

 

[573dawn]

No, I checked all IP trunks, none have it enabled.

 

[tlpeter]

try it with disabling direct mediapath

ACA - Implement IP Office
ACA - Voice Services Management
______________
Women and cats can do as they please and men and dogs should relax and get used to the idea!

 

[573dawn]

tlpeter, where would I find that?

Thanks, Dawn

 

[tlpeter]

you can find it on the tab voip settings at your ip trunk

if checked then uncheck allow direct mediapath
it forces the system to keep using a vcm channel
sometimes it gives some trouble when this is allowed


ACA - Implement IP Office
ACA - Voice Services Management
______________
Women and cats can do as they please and men and dogs should relax and get used to the idea!

 

[573dawn]

Yep, it was checked, I have unchecked it and maybe we will see more improvement. Turning off the AGC seems to have helped some, but we are still having alot of problems.

Thanks, Dawn

 

[573dawn]

What about the silence suppression? It is not enabled on any trunk.

 

[tlpeter]

don't do
silent suppresion will kill the background noise
an example

if you call someone with a analog line to somebody else with also an analog line you will here background noise if nobody is talking
if it isn't there you will think there is no connection because it is completly silent
turning on silent suppresion will do that
so this has nothing to do with the problem


ACA - Implement IP Office
ACA - Voice Services Management
______________
Women and cats can do as they please and men and dogs should relax and get used to the idea!