cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
11573
Views
10
Helpful
13
Replies
Highlighted
Beginner

ASCOM wifi phone problems

Hello;

I have a problem with wireless phones are brand ASCOM. Are supported by Cisco.
The problem is that, without moving your site, you lose your coverage and 3 seconds back. The configuration of the WLC is recommended by ASCOM.
The wifi network is composed of 160 AP's.

Please I need help because it has become a very urgent problem.

Thank you very much in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
Rising star

Ascom has also had issues in the past with connectivity to an SSID that has Aironet Extensions enabled on it especially if you had more than 4 SSID's.  If Aironet Extensions is enabled on that SSID I would try disabling it and see if it helps.

View solution in original post

13 REPLIES 13
Highlighted
Cisco Employee

I'm highly suspicious that Ascom knows anything about proper WLC voice configuration ...

Maybe you can post your wlc "show run-config" to start ?

You can also collect traffic stream metrics on the WLC or phone statistics to identify if there are packet drops or whatever noticeable.

Nicolas

Highlighted

Hello,

I configured the WLC as recommended to me Ascom. The problem has improved but we still have random cuts.

Thanks in advanced.

Highlighted

Again, please post your configuration so that we can comment it.

Nicolas

Highlighted

Hello,

I attach the configuration and a pdf with the recomendations of Ascom.

Thanks.

Highlighted

Are your phones using the a band or the b/g band ?

I see that all APs are at max power which usually indicates poor coverage.

Is there a feature on the phone to show the current signal strength ? If yes can you walk around and note down the lowest signal strengths observed ?

Nicolas

Highlighted

We are using the b / g / n band.

We configure the maximum power because we thought it would be the problem. We have a wifi network with high density of APs.

In the phone can see the RSSI and Ap which is connected at that time.

Is it possible that the problem is that the phone detects too many Ap's?

Highlighted

The b/g/n band when there are so many SSIDs with laptop is a huge risk in the first place.

I see in your configuration that the APs are set to global configuration so it's the WLC which decided of power level 1 it seems.

You attached a "show run-config no-ap" so I cannot comment on the density of APs. I find it strange that you call it high density and that the WLC would give the max power to all APs.

Yes too many APs at too much power is a problem as it just creates too many interferences.

Nicolas

Highlighted

I attach the complete configuration.

We configure the AP's with the full power to try to resolve the problem.

The WCS hasn´t interference alarms.

Highlighted
Beginner

Had this same issue and went to Ascom with the following

i62    does not support CCKM or 802.11r

        begins looking at 6dBm differences when it drops to a -70dBm signal

        begins looking at 3dBm differences when it drops to a -73 dBm signal

        beacons every 6 seconds.

        Running sw ver. 2.2.22

Mark Bailey - Ascom technician recommended moving to 2.5.9 as this addresses the observed drops in an active conversation.  The call does not drop, just the audio. Has to do with polling multiple AP's causing CPU to get too busy (typical environment). It looks like they changed the polling interval to free up SPU cycles (release notes don't show this bug - Internal bug) - This bug has been around for a long time and just recently got fixed.

2.5.9 requires no change to the VoIP gateway.  Upgrading the phones to the latest release, 4.1.12 requires VoIP gateway upgrade as well.

Moving to 2.5.9 fixed the intermittant loss of voice issues went away. Good Luck

Highlighted
Hall of Fame Community Legend

There's a bug in the way ASCOM phones interpret 802.1n traffic. The workaround is to disable 802.1n on the phones.

Kindly refer to: CSCud65237

Sent from Cisco Technical Support iPhone App

Highlighted
Rising star

Ascom has also had issues in the past with connectivity to an SSID that has Aironet Extensions enabled on it especially if you had more than 4 SSID's.  If Aironet Extensions is enabled on that SSID I would try disabling it and see if it helps.

View solution in original post

Highlighted

My customer has thought in remove the Ascom telephone.

thank you very much for your help.

Highlighted
Cisco Employee

Ascom having issues working with unii2 and unii2 extended channel.

When using primary and secondary channel there's an voice issue. Disable 40Mhz and enable 20Mhz.

Ascom's I62 sets that were not allowing for the amount of frequency offset required per IEEE specifications. you've to contact Ascom to get the fixed code, Hope they help here.

Content for Community-Ad