I have an ATA 186. Both ports are registered with CM no problem. CSS and PT are all fine. When I put an analog phone on port one everything is fine. When I put it in to port two, the analog could ring IP phone but get busy tone when user pick up IP Phone. Anything special about port two? I have put another ATA but same problem. CM is 4.1.3 ATA load is the latest SCCP load. Anything else I should look at?
Hi, the only limitation I know it's about the codec, ATA 186 does not support two ports that use G.729a codec simultaneously. The G.729 codec can only run on one port at a time. When one port uses G.729, other port uses G.711 and if you have defined regions that only permits G.729 you're not going to be able to establish the second call.
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The short answer is that you don't.... That isn't entirely true while at
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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 ...