NetVanta 3430 Multiservice Router including Session Border Controller Feature Pack. Includes 2 10/100BaseT Ethernet interfaces and one NIM slot. In addition to stateful inspection firewall, B2BUA, SIP proxy, and full featured business class router, the SBC feature pack includes robust features such as SIP header manipulation and media anchoring for normalization between disparate SIP networks. Supports 50 simultaneous sessions. (Note: This device cannot be field upgraded to support additional SBC sessions.)