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SIP signalling traffic being dropped erroneously

Question asked by Mo Imran on Jan 3, 2019
Latest reply on Jan 22, 2019 by Mo Imran



We recently noticed SIP signalling traffic (5060/udp) being dropped following a working configuration and appears to be happening to just one of two SIP gateways IP addresses , which have the same configuration. 


Background/Setup information:

The SIP gateways are on a private network however (static) NAT'ed for access to the external SIP endpoints. bi-directional access on ports: a) 5060/udp using sip_any service and the sip_media ports. 

The config has worked OK for quite a while and up until a few days ago when we migrated to R80.10. (T_154)


The issue:

Packets are not being dropped by IPS or hitting any of our rulebase but we can see that they are being subtly dropped by “fw_conn_post_inspect”


Has anyone else seen this issue? Any idea/suggestions on a workaround or how to bypass this?