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

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,, 14.0.0,,,,,, 14.0.1,, 14.1.0,,,,,, 14.1.2,,,,, 15.0.0, 15.0.1,,,

Fixed In:

Opened: Jul 30, 2019
Severity: 2-Critical


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.


SIP calls are unable to establish media connections.


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


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