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asa sip inspection does not work all the time

loizosko
Level 1
Level 1

our cube is behind the asa (asa5515) and there is one to one nat. the related ports are open from the provider's sbc.

sip inspection is enabled.

at random occasions inbound calls have no audio or they drop. after we opened a ticket with the provider they send the debugs and their traces show that they see the internal cube ip address instead of the nat ip. 

i can't replicate the issue on demand. it happens totally randomly.

i have same setup (cube behind asa and same sip trunk provider) for another client and they experience same issue.

any ideals appreciated.

1 Reply 1

Manish Gogna
Cisco Employee
Cisco Employee

Hi,

What are the CUCM and ASA versions involved in this case?

There are a few bugs related to SIp inspection on ASA that you can verify

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCto50963/?reffering_site=dumpcr

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCsi29725/?reffering_site=dumpcr

HTH

Manish