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Cisco 1900 Series Integrated Services Routers

Series Comparison
Models Comparison
  3945 3925 2951 2921 2911 2901 1941/1941W
Form Factor 3 RU 3 RU 2 RU 2 RU 2 RU 1 RU 2 RU
Integrated WAN Ports 3 Gigabit Ethernet
(2 SFP) 		3 Gigabit Ethernet
(2 SFP) 		3 Gigabit Ethernet
(1 SFP) 		3 Gigabit Ethernet
(1 SFP) 		3 Gigabit Ethernet 2 Gigabit Ethernet 2 Gigabit Ethernet
Interface Slots (EHWIC) 4 4 4 4 4 4 2
Service Module Slots 4 2 2 1 1 0 0
ISM Slots 1 1 1 1 1 1 1
PVDM Slots 4 4 3 3 2 2 0
USB Ports (v2.0) 2 2 2 2 2 2 2
Default/Max Flash 256 MB/ 4 GB 256 MB/ 4GB 256 MB/ 4 GB 256 MB/ 4 GB 256 MB/ 4 GB 256 MB/ 4 GB 256 MB/ 4 GB
Default/Max SDRAM 1 GB/ 4 GB* 1 GB/ 4 GB* 512 MB/ 4 GB* 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/ 2.5 GB 512 MB/ 2.5 GB
Modular LAN Switchports (with Optional POE) 98** 74 ** 50** 50** 24** 16 11
Advanced Security Enabled via security license for the Universal IOS image. IPS and content filtering need additional subscription licenses.
Stateful Firewall Yes Yes Yes Yes Yes Yes Yes
Onboard Hardware VPN Acceleration (DES, 3DES, AES) Yes Yes Yes Yes Yes Yes Yes
Intrusion Prevention Yes Yes Yes Yes Yes Yes Yes
Content Filtering Yes Yes Yes Yes Yes Yes Yes
Unified Communications Enabled via Unified Communications license for the Universal IOS image. CCME/SRST support are available through separate feature licenses.
Local Conferencing Yes; use PVDM3 Yes; use PVDM3 Yes; use PVDM3 Yes; use PVDM3 Yes; use PVDM3 Yes; use PVDM3 n/a
Voice Digital Signal Processor Support PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 PVDM3 and PVDM2 n/a
Survivable Site Telephony Support Up to 1200 Up to 730 Up to 250 Up to 100 Up to 50 Up to 35 n/a
Cisco CallManager Express Support Up to 350*** Up to 250*** Up to 150 Up to 100 Up to 50 Up to 35 n/a
Cisco Unity Express (NM, SM, or ISM) 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 32 ports; 300 mailboxes 10 ports; 100 mailboxes n/a
SIP Sessions 1000 800 600 400 200 100 n/a
Digital Voice Support Up to 720 Up to 480 Up to 400 Up to 240 Up to 150 Up to 100 n/a
Maximum Voice Support for Analog/BRI FXS 112, FXO 64, BRI 40 FXS 64, FXO 40, BRI 24 FXS 64, FXO 40, BRI 24 FXS 40, FXO 28, BRI 16 FXS 40, FXO 28, BRI 16 FXS 16, FXO 16, BRI 8 n/a

* Up to 2 GB available for use; upgradable to 4 GB in the future.
** LAN switching counts for ISR 2911 through 3945 are based on the latest generation of Switch Service Modules.
*** Scales to documented phone support in 15.0.1 rebuild.