I have a customer with a voice quality issue that I'm having a hard time fixing. The complaints are only coming from two (very important) people who happen to make a lot of long distance calls. They say that call placed to a handful of area codes (3 or 4 have been identified) contain static and noticeable delay much like a poor cell phone call (I'm assured the destination is not a cell phone).
The issue seems to only affect the IP phone user.
I haven't been able to monitor the gateway while one of these calls is occurring but whenever I get a complaint I've checked the CMRs and the latency, jitter, drops are all 0 and the codec is G711.
I don't think the calls are using dial-peer 0 but I don't know of any way to confirm that without monitoring the gateway during the call. I've pasted a portion of the config from their 2651xm PRI gateway below.
My other thought is that the echo cancellation might be responsible. Is that possible? I'm using the enhanced echo cancellation and have it set to 64ms.
The load on the gateway is 12.3(4)T. Call Manager is 3.3.3sr2
I had the same exact issue at two of our sites. However we are using Call Mgr Express, not Call Manager, so I do not know if the issue is the same. I was advised to update the .bin file for the phone load to the newest one, and had to upgrade the Call Manager express software for a new DSP. It worked great. Is there a newer version of phone load or software you could upgrade to?
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...