Bug ID 811105: MRF SIP-ALG drops SIP 183 and 200 OK messages

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
13.1.0, 13.1.0.1, 13.1.0.2, 13.1.0.3, 13.1.0.4, 13.1.0.5, 13.1.0.6, 13.1.0.7, 13.1.0.8, 13.1.1, 13.1.1.2, 13.1.1.3, 13.1.1.4, 13.1.1.5, 13.1.3, 13.1.3.1, 13.1.3.2, 13.1.3.3, 14.0.0, 14.0.0.1, 14.0.0.2, 14.0.0.3, 14.0.0.4, 14.0.0.5, 14.0.1, 14.0.1.1, 14.1.0.6, 14.1.2, 14.1.2.1, 14.1.2.2, 14.1.2.3, 14.1.2.4, 15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3

Fixed In:
15.1.0, 15.0.1.4, 14.1.2.5, 13.1.3.4

Opened: Jul 30, 2019

Severity: 2-Critical

Symptoms

SIP 183 and 200 OK messages are dropped after an INVITE in MRF SIP-ALG when media info is present in the Session Description Protocol.

Impact

SIP calls are unable to establish media connections.

Conditions

- MRF SIP-ALG default configuration - INVITE sent with media info in SDP - Media info contains an rtcp without an IP address

Workaround

Ensure all RTCP attributes in the SDP have IP addresses. Example: Change "a=rtcp:29974\r\n" to "a=rtcp:29974 IN IP4 10.10.10.10\r\n"

Fix Information

Calls are able to establish media connections in MRF SIP-ALG when media info contains an RTCP with no IP information.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips