Hello, thank you for reading my question. I am at wits end!
My company uses Cisco VoIP for our phones, and one such phone is our primary conference phone, a Cisco 7937. If we are on a call that lasts for any extended period of time (45 minutes to an hour) sometime during that call inbound voice will drop. Not just get quiet or choppy, but completely drop. Here is what I have tried so far, and then I will get into more anecdotal symptoms.
Intitially we were using a Cisco 7936, when this error started happening we switched that out with a 7937, no resolution.
We switched cables
We switched ports
We switched switches
We ran a packet capture, and noticed no dropped packets
While pinging the phone, response time is 1-3 ms
So all of the so called basic things have been done as far as I can tell. I am not telephony expert by a long shot (I do databases and application support) so the more advanced options for trouble shooting that you fine people may be aware of are not in my radar. Again the call does not drop completely, it only seems that inbound voice is dropped. Those on the other end do not seem to complain about not being able to hear us so it seems to not be both ways (of course they may just assume it is on their end and not mention it) but all evidence points to inbound only.
It /may/ only be when we are using Cisco MeetingPlace Express but I can not be sure if that is a variable or a constant.
Sorry for the lack of information, as I said not a phone expert but would appreciate any help you could offer
Re: Voice drops for five to ten seconds during calls
It appears that simply removing the access vlan from the swithport configuration (and leaving in the voice vlan command) fixed the issue. I was able reproduce the problem on demand by simply adding the “switchport access vlan” command back in the config and bouncing the port on the switch. We tested its multiple times and that appears to be controlling it. As soon as I add the command back into the switch and we start a new call, I can watch the “Rcvr Lost Packets” increment steadily within about 30 seconds or so, when I remove it we can keep calls up indefinitely without a single packet drop.
Oddly enough simply adding the access vlan command without the voice vlan command did not fix the problem, it was only when i left the voice vlan and removed the access vlan that it worked
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