question about remote ip phone can't dial out to PSTN
Local Cisco2821 with IOS12.3(14)T and CME,more than 20 local ip phones(Cisco7940) and 3 remote ip phones (Cisco7940,connected through vpn) regiested to this router.
All 7940s can call each other successfully,but only when the 3 remote ip phones dial out to PSTN,"connected" in the caller's phone screen, the called phone(include mobile phone) can receive the call,ringing,pickup the handset,but no voice can be heard.
Remote phone:extension 5297/5298/5299
5297 dial 5298 and 5298 dial 5297,it's ok.
5297 dial 5201,it's ok.
5297 dial out to PSTN by dial "9,63912848" or "9,mobile phone number",the called phone ring,pickup,no voice.
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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 ...