Hello Leornadus,
I do not see any restriction adding a Network module in your 2811 with the two VICs you mentioned or any hardware limitation for the utilization of all these VIC/HWIC combinaison =>
The different Cisco links states Cisco 2811 supports : 4 HWIC slots, 1 expansion network module slot, 2 PVDM slots, 2 AIM slots
As you suggested NM-HD-2V-(E in function of the needs) is the most appropriate choice in your scenario and supports two VIC3-2E/M =>
http://www.cisco.com/en/US/prod/collateral/routers/ps259/product_data_sheet09186a00800921e7_ps3115_Products_Data_Sheet.html
Minimum release for VIC3-2E/M is 12.4(20)T (or 12.4(15)XW) in « ipvoice IOS »– Table 4 (and 10) http://www.cisco.com/en/US/prod/collateral/modules/ps5365/product_data_sheet0900aecd801c595e.html
The VIC3 utilization in a NM should be the same as if it was in a HWIC slot exept the interface naming will change => The NM-HD-2V will be changed to slot 1/x/y (instead of 0/./.)
Please note your already existing VIC-2E/M are not supported in the Cisco IP Communications Voice/Fax Network Modules (NM-HD-1V, NM-HD-2V and NM-HD-2VE).
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080094ab9.shtml#productnumbers
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a0080094ab9.shtml#productnumbershttp://www.cisco.com/en/US/products/hw/routers/ps259/products_tech_note09186a00800e73f6.shtml
As you may guess if you add this NM (with 2 VICs) there will be no more room in the 2811 :-)
And if another evolution is needed (!!!) either you can upgrade the hardware to a more large 28xx platform..Or to a ISR2 but in this case you will have to reconsider the complete compatibility matrix (another story …)..
I would also pay attention to the PVDM-2 requirments with the introduction of the NM and 2 VIC3-E/M (but I think the best if some information is needed on this would be to post in IP Telephony area in this case)…
Hope that helps.
Kind regards.
Karim
