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Assessment Title
Rule Text
The Session Border Controller (SBC) must drop all SIP and AS-SIP packets except those secured with TLS.
Description
Discussion Text
DISN NIPRNet IPVS PMO and the UCR require all session signaling across the DISN WAN and between the LSC and EBC to be secured with TLS. The standard IANA assigned IP port for SIP protected by TLS (SIP-TLS) is 5061. DoD PPSM requires that protocols traversing the DISN and DoD enclave boundaries use the standard IP ports for the specific protocol. Since AS-SIP is a standardized extension of the SIP protocol and since AS-SIP must be protected by TLS, AS-SIP-TLS must use IP port 5061. The VVoIP system may allow SIP and SRTP traffic encrypted and encapsulated using TLS on port 443 from Cloud Service Providers.
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