I'm unable to establish a call between a H.323 endpoint such as NetMeeting and the PSTN while passing by a Cisco H.323 gateway. The gateway reject the call and send the reason ResourceUnavailable. My CCM is a ICS-7750.
My first guess will be some codec option that the netmeeting client is sending in the Setup message towards the Gateway. make sure they are supported on the GW. My second suggestion will be to turn on some debug (both h323 and isdn q931) on the GW (hopefully it is not too busy). the ResouceUnavailable can be a mapping of an error code generated on the PSTN side, such as an invalid number, or bad number format.
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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 ...