SBC (Session Border Controller) is a commonly available functional element that provides security, NAT (Network Address Translation) traversal, protocol repair and other functions to VoIP signaling such as SIP. A component of a Border Control Function.
Relevant NENA Documents
Note: To find and download the document, copy the document number (like NENA-STA-010) from below and search the NENA Standards and Documents page.
NENA-STA-010, NENA i3 Standard for Next Generation 9-1-1