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New Member

roaming/quality of speech problems 7920

I have a problem with the connection/quality of speech when standing within 2-3 meters away of an AP with a 7920 phone. Also The connection to the CM is broken sometimes. (Also during a call) after the call drops the phone will connect to the CM automatically.

Phone software : 7920.3.3-01-06

Call manager : 3.3.3

AP : Cisco 1230 + 4941 'duck' antenna's

128 WEP is used, vlans are used no fancy stuff....

Also the quality of speech in not great...Hick-up's occure, calls drop sometimes.

the sitesurvey is OK. No overlapping channels (1,6,11) the RSSI is alway's above 20 , QBSS (CU) is also fine.

Does anyone have similar issue's. With this software

Reg

Goen

11 REPLIES
Cisco Employee

Re: roaming/quality of speech problems 7920

Hi there,

Can you advise what the output power on the APs you are using is set to?

Scott

New Member

Re: roaming/quality of speech problems 7920

50 mw. We also changed to 20 mW, however same problems remain. (a bit less to be honest)

New Member

Re: roaming/quality of speech problems 7920

I'm having the same issues. When you start to experience qos issues, how many phone calls are active on the AP?

New Member

Re: roaming/quality of speech problems 7920

Not much , on some pionts only two or three active calls.

New Member

Re: roaming/quality of speech problems 7920

Did you ever resolve your issue with the phones?

Thanks.

New Member

Re: roaming/quality of speech problems 7920

Not really, we just implemented the new 13JA2 software on the 1200's...See if this helps.

Reg

Goen

Cisco Employee

Re: roaming/quality of speech problems 7920

Goen,

Are you running VxWorks or IOS on the APs?

Thanks,

Scott

New Member

Re: roaming/quality of speech problems 7920

IOS , just upgraded to 13JA2...See if this helps

Reg

Goen

New Member

Re: roaming/quality of speech problems 7920

A couple of things we have discovered:

The phone likes choses. It may not roam well with just one AP as a chose, but will roam well if it has 2 to choose from.

Having RSSI levels above 20 just doesn't cut it when roaming. Develop roaming areas to allow the phone to have a couple of APs to choose from with RSSI values >=40.

New Member

Re: roaming/quality of speech problems 7920

Ensure you have latest firmware (1.07 for 7920 and 12.2(15)ja for IOS AP).

New Member

Re: roaming/quality of speech problems 7920

I am having a similair problem except i am using CCM 3.3(4) and AP 1120B did you manage to resolve this problem.

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