I have an NEC 2400 IMX connected via a PRI to a 2851 series router which in turn is connected to UCM 6.1 via MGCP. 4 digit dialing works great between NEC phones and the ip phones. DID calls into the IP phones work great. However, when I try to call out to an external number from the IP phone it looks as though the NEC side is stripping it down to 4 digits no matter what.
This sounds like an issue on the NEC configuration. I am a little rusty on my 2400 programming, but I know trunk to trunk would need to be enabled and possibly some digit manipulation too. Maybe you can engage the NEC vendor to help? Do you have access to the 2400 MAT?
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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 ...