All SIP and AS-SIP packets are not dropped by the DISN NIPRNet IPVS firewall (EBC) except those AS-SIP packets arriving on IP Port 5061 that are secured with TLS.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-19670	VVoIP 6325 (DISN-IPVS)	SV-21811r1_rule	ECSC-1	Medium

Description
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 port(s) 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.

Description

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 port(s) 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.

STIG	Date
Voice/Video over Internet Protocol (VVoIP) STIG	2015-12-29

Details

Check Text ( C-24048r1_chk )
Interview the IAO to confirm compliance with the following requirement: Ensure the DISN NIPRNet IPVS firewall (EBC) is configured to drop the following signaling packets: > SIP packets arriving on IP port 5060 or 5061 > AS-SIP packets arriving on IP port 5060 > AS-SIP packets arriving on IP port 5061 not secured with TLS

Fix Text (F-20376r1_fix)
Ensure the DISN NIPRNet IPVS firewall (EBC) is configured to drop the following signaling packets: > SIP packets arriving on IP port 5060 or 5061 > AS-SIP packets arriving on IP port 5060 > AS-SIP packets arriving on IP port 5061 not secured with TLS