topic Re: ASCOM wifi phone problems in Wireless

ASCOM wifi phone problems

jimontoro — Sun, 04 Jul 2021 02:57:05 GMT

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.

Re: ASCOM wifi phone problems

Nicolas Darchis — Mon, 14 Mar 2011 17:05:24 GMT

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

Re: ASCOM wifi phone problems

jimontoro — Tue, 15 Mar 2011 08:08:42 GMT

Hello,

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

Thanks in advanced.

Re: ASCOM wifi phone problems

Nicolas Darchis — Tue, 15 Mar 2011 08:29:24 GMT

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

Nicolas

Re: ASCOM wifi phone problems

jimontoro — Tue, 15 Mar 2011 08:55:12 GMT

Hello,

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

Thanks.

Re: ASCOM wifi phone problems

Nicolas Darchis — Tue, 15 Mar 2011 10:11:08 GMT

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

Re: ASCOM wifi phone problems

jimontoro — Tue, 15 Mar 2011 10:24:20 GMT

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?

Re: ASCOM wifi phone problems

Nicolas Darchis — Tue, 15 Mar 2011 10:44:35 GMT

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

Re: ASCOM wifi phone problems

jimontoro — Tue, 15 Mar 2011 11:32:02 GMT

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.

ASCOM wifi phone problems

jcomphel — Fri, 18 Jan 2013 19:46:03 GMT

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

Re: ASCOM wifi phone problems

Leo Laohoo — Fri, 18 Jan 2013 23:01:57 GMT

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

Re: ASCOM wifi phone problems

Kayle Miller — Mon, 28 Jan 2013 15:03:11 GMT

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.

Re: ASCOM wifi phone problems

jimontoro — Wed, 20 Feb 2013 12:36:22 GMT

My customer has thought in remove the Ascom telephone.

thank you very much for your help.

ASCOM wifi phone problems

Saravanan Lakshmanan — Mon, 25 Feb 2013 05:25:14 GMT

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.