To my knowledge there is not a four-port voice capable BRI card, only the VIC-2BRI-NT/TE. You can certainly add one more of those as it sounds like only three of the four EHWIC slots have been consumed. The higher-density option would be a PRI instead of a BRI which would use a VWIC3-1MFT-T1/E1 card. Alternatively you may want to consider a SIP trunk which eliminates the legacy TDM handoff entirely and uses a software feature called Cisco Unified Border Element (CUBE) on the 2921 instead.
Any time you add additional voice interfaces, or want to increase dspfarm capacity you need PVDM3 capacity. There is a excellent calculator to guide you in the sizing process:
The basic module (EVM-HD-8FXS/DID) provides 8 FXS/DID ports and it can accomodate two expansion cards. There is a four port BRI expansion module available (EM-4BRI-NT/TE) so this card could potentially give you 8 x FXS/DID and 8 x ISDN BRI.
It was originally designed for the 2800 routers and needs an adapter (SM-NM-ADPTR) for use in the 2900 series. It is also old so may be due an End of Sale notice soon.
The card does not provide any DSP resources so you may need to add extra PVDM3 resources to your 2900.
As mentioned by Jonathan I would have a think before commiting to lots of BRI circuits. PRI or SIP is likely to be more cost effective in the longer term.
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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 ...