Last Modified: Sep 13, 2023
Known Affected Versions:
11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.2, 11.5.3, 11.5.4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10
Opened: May 21, 2013 Severity: 2-Critical Related Article:
Related Article: K15993
SIP messages are sent directly to the peer and not to the SIP-Proxy when both peers are inside the NAT.
Some SIP messages may not be seen by the SIP-Proxy and cause missed messages and accounting gaps.
-- CGNAT and SIP-ALG are configured. -- Peer1 and Peer2 are in the NAT'd network (subscribers). -- SIP-Proxy is located outside the NAT network (internet).
SIP messages through the SIP-ALG are no longer hairpinned when the destination address is not inside the NAT.