I am using Cisco Unity Call Manager 5.1 (3),and the Voice gateway is Cisco2821,and I have 200 IP 7940 G phones nad the PSTN is terminated to cisco 2821 router where the same E1 PRI is also terminated.
Now the problem is from any IP phone to IP phone it is working fine,but when I make a call from IP phone to PSTN phone,the call is landing and the PSTN user pick up call and He/She is able to listen the voice,but the IP phone user is not able to listen the voice.
What could be the problem? I am new to IP telephone.
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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 ...