Your issue sounds similar to this one:   https://community.cisco.com/t5/ip-telephony-and-phones/cisco-ata-190-bug-fix-cscuu50356/td-p/2810351  ... View more

That's strange, what you're describing is the classic "Electronic Hookswitch Control" issue but you said you have enabled that already. be sure to check the switch on the underside of the headset's base station to ensure you have it set to the appropriate numbers for Cisco handsets. Be sure that you have applied config on the handsets after enabling hookswitch control as well. A reset never goes astray either. ... View more

There's a number of unknown variables here to be able to offer a lot of help. Getting the logs and interface stats are good starts, but maybe find out what the server does.   Is it a virtualization server like ESX, HyperV, OVM etc? Does the server have NIC teaming setup? Is the switch port in an error disabled state?  (sh int status) What's the config of the port? Is it appropriate for the server? When you say 'lost network connection', do you mean the link light completely goes out or does the light stay on but server has no network connectivity? I assume a shut/no shut on the switch port does not resolve the issue when it occurs? Note that this can have a different effect to removing a network cable and reinstalling it. Such as spanning tree having shutdown the port for example. Has it happened only the once or several times? What type of port is it?  (SFP, TenGig, GigEth etc) Without any of the above info it will be difficult to determine what may be happening. HP support won't help you with switch config review and if the only thing they have heard is that rebooting the switch fixes it, they will always blame the switch. ... View more

How far are the clients from the access points? I'm curious about the signal power issue you mentioned. You set the power to level 1, so they were previously set to something lower or did the WLC auto assign a lower power level? Note that at least 3 AP's need to see each other for RRM to do it's work and set power levels, else you'll find they're all power level 1. The reason for asking about distance is due to a couple of reasons: Since you're wanting high throughput such as 800Mbps, we're dealing with the 5 GHz network. The 5 GHz network, whilst less susceptible to interference, does not have as good range or penetration. So I have a few questions: How far is the client from the AP? Are there obstacles in between the client and AP? How many SSID's are you broadcasting on the APs? How many clients are connected to the AP simultaneously? What kind of switch is the AP connected to and can you post the config of the port including a "sh int xx/xx" (interface and port type in there) Do you have any QoS configured on the SSID? Remember that setting an AP to '1' makes it 'full power', but that doesn't mean the client's radio can transmit data back to the AP. Ideally the AP and client transmit power should match (such as 17dB).  Also bear in mind, at least in the 'Z' domain of WLC's and AP's, WLC version less than 8.3 suffers from lower transmit power, even at power level 1. I have found in many cases, power level 1 is 13dB (AP model dependent), whereas upgrading to 8.3 jumped the same AP up to 22dB. From 8.3 this is fixed, but be weary of going of going to 8.3 unless you really really need to. ... View more

The Network Busy issue is a known defect on the 8821 handset. TAC told me to disable ACM on the WLC (Wireless tab > 802.11a/n/ac or b/g > Media and then the Call Admission Control checkbox as a workaround. I didn't do it as I prefer having it on and the issue wasn't regular enough to worry about for now. ... View more

Highly recommend updating to firmware 11.0.3 at a minimum. I'm on 11.0.3ES1 currently due to a long-lasting TAC case with Cisco over numerous issues with the 8821 handsets. I can say for sure your point # 2 above is common for me as well. I can't be of any help on your other 2 points though sorry. We run CUCM 11.5 so self care is available, and I also don't know a way to import or automate the entry of the userid and password for the personal directory. Our staff have had to enter this manually on their handsets. ... View more

You seem to be denying your Gi0/1 interface's subnet (192.168.200.0/24) from being NAT'ed to the Internet (or rather back the other way). You have it denied with the line ip access-list deny ip any 192.168.0.0 0.0.255.255   <<< this includes 192.168.200.0 Any reason you want to deny the LAN subnet in this way? You can try and add this line above that somewhere: ip access-list 100 permit ip 192.168.200.0 0.0.0.255 any ... View more

Good find. It's not something I have come across but i've been working with Cisco for almost 3 weeks now on our 8821 handsets. Firmware 11.0(3) resolves over 100 bugs, with more still to be fixed. I don't see your issue in an export of 8821 bugs I received so best if you raise it with TAC to get it identified and fixed. ... View more

No I haven't had this issue myself. If you are running firmware prior to 11.0(3) then the phone will use the data VLAN to pickup an IP address (NOT the Voice VLAN), so make sure the switch port the dock is now connected to has a regular access VLAN on it and that your option 150 TFTP address is set on that VLAN in DHCP. Might be worth resetting all setting son the phone too, in case your failed imports broke anything. ... View more

What is the source and destination addresses you are using? I'm just trying to understand your interface configurations and the flow of packets you need. I imagine Gig0/0 is your WAN link and that the mail server is out on the WAN somewhere since you said 'external mail server'? Are you trying to contact a mail server on port 110 (in the WAN) from a device on the Gig0/1 interface? ... View more

So looks like it's constantly failing to send (tx) packets and drops into standalone mode. Is this the only AP having this issue at the site? Can you provide your switch port configuration? Typical things i'd check for us that the switch port security, ensuring basically that there is none (i.e no MAC address maximums for instance). Is there any interface errors and packet loss on the switch port connected to this AP? And do the WLC trap logs provide any further information from it's end other than saying AP being disassociated and "Link Failure"? Is there congestion on the link between the AP and the WLC at all, and if there is, is the CAPWAP traffic prioritised? ... View more

I'm sorry i'm not familiar with this particular issue, but I can say that it is well worth the money to buy at least one of the 8821 docking stations and a USB-to-Ethernet adapter to plug into it. Ensure your User VLAN has Cisco's TFTP option 150 set and setup a WLAN profile in CUCM. Then dock the handset and it will find CUCM, download it's config including wifi settings and you're off! So much easier. The USB-Ethernet adapter I use is a regular one I got from Dell. Nothing special. Also highly recommend running at least firmware 11.0(3) on the handset. ... View more

Could you provide your "sh run" config to review. ... View more