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New Member

7921G 5sec Audio Delay..


I seem to be getting a 5sec audio delay with peer-to-peer conversations ? at first you answer "hello" wait a few secs then hear them saynig "hello" and then your eventually connected ?

what could this be, i have ample signal strengh

many thanks

Cisco Employee

Re: 7921G 5sec Audio Delay..

Is it only at the beginning of a call?

Can you provide more info on your WLAN?

AP type, versions, etc.?

What is the 7921 firmware version?

What type of authentication / encryption is used?

Is dot1x reauth or session timeout enabled?

New Member

Re: 7921G 5sec Audio Delay..

1. yes initialy at begining of call (now down to 1 sec delay)

7921 firmware is:

App Load ID:


Boot Load ID:


WLAN Driver ID

WLAN Firmware ID


not sure how you would update the firmware on these phones, they were very new at the time and we may have an older load on them. sorry for being a newb with this.


Re: 7921G 5sec Audio Delay..

Please verify that you are using the admission control version for the newer 7920 and the new 7921 phones. This is under the configuration for voip.

New Member

Re: 7921G 5sec Audio Delay..

firstly thankyou for your reply dennis.

where am i looking for the configuration for Voip (had a look couldnt find) in the phone settings or on the callmanager ?

again thanks for this help

Re: 7921G 5sec Audio Delay..

It is on the Wlan Controller under wireless I believe.

Cisco Employee

Re: 7921G 5sec Audio Delay..

Enabling CAC will not help reduce audio gaps.

But if you want to enable CAC/TSPEC, it's under the Wireless menu, under 802.11a or 802.11b/g, then Voice.

If using both TSPEC and non-TSPEC enabled clients, then advise to enable load based CAC, which is available in the 4.1 WLAN controller release.

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