09-07-2017 12:03 AM - edited 07-05-2021 07:37 AM
Hi all
Since 2 weeks we have 10 8821 Cisco IP Phones in use. On every Phones we have a poor Battery Standby Time. According the Data sheet we should have a Standby Time about 200 hours.
The Battery on our Phones is over one night empty.
System we run:
Solved! Go to Solution.
09-13-2017 02:28 AM
I'm not sure but certainly possible. You can go to 8.2.x with 1142 as far as I know before there's a hard limit it's just some features after 8.0 are unsupported. You can definitely go to full-featured 8.0.x with them.
Ric
09-12-2017 07:51 AM
Have you tried:
Ric
09-13-2017 12:49 AM
Thanks Ric
1. DTIM period on WLC is already set to 2, but the WLAN diagnostic on the 8821 shows a 0. On 7925
phones is a 2.
WLC Software Version is 7.6.130.0. Could that be the reason? I cannot upgrade to 8.x, otherwise
35 Access Points 1142 will get obsolete.
2. I Will try that
3. Proxy ARP is already enabled
Regards
Andreas
09-13-2017 02:28 AM
I'm not sure but certainly possible. You can go to 8.2.x with 1142 as far as I know before there's a hard limit it's just some features after 8.0 are unsupported. You can definitely go to full-featured 8.0.x with them.
Ric
10-04-2017 04:27 AM
Hi Andreas!
We have the same issue since already May. We use ~620 phones in our facility.
I see that the problem is solved for you, can you tell me what exactly solved the problem? And how´s about the voice-quality with the on call power save activated?
Bluetooth is off
802.11 is 5GHz only
On call power save is DEACTIVATED
10-04-2017 04:58 AM
Hi Roman
Honestly I maybe was a little to early with my statement that the problem is solved, I'm sorry for that.
On the Wireless Controller we run the Software Version 7.6.130.0.
Recommended is 8.0.140.0, 8.2.151.0 or 8.3.112.0
In the next few weeks we plan an upgrade on the WLC to Version 8.3.112.0 and I hope this will solve the problem.
Regards
Andreas
11-01-2017 07:46 AM - edited 11-01-2017 07:47 AM
Hi Andreas
Did you resolve the problem by upgrading the WLC ?Thanks
Regards
Jasper
11-13-2017 08:21 AM
Hello Andreas,
Please let us know if you resolved the issue. If not here are a couple of things that might be affecting the battery life.
1. Defect CSCvf59659 deals with phone logging that keeps the phone in an active mode so it never goes to standby mode which can drain the battery. This will be fixed in firmware SR6 which should be out in the next week.
2. Check to see if the 8821 phone ever goes into sleep mode. If it does not change the sleep to another time setting first then check if it goes into that sleep mode at that time. the sleep setting is under the phone display settings on the phone. I have seen an issue where some new 8821 phones don't do to sleep until that setting is changed at least once.
Thanks
Gordon
11-14-2017 07:19 PM
11-15-2017 07:26 AM - edited 11-15-2017 07:29 AM
The following defect fixes are resolved starting in SR6.
CSCvg46824
CSCvg40435
CSCvg66059
CSCvg69345
CSCvg64790
CSCvg45158
CSCvg74852
CSCvg68954
CSCvg61117
11-15-2017 02:26 PM
Thanks Gordon.
Cheers
Jasper
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