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Voice flow through ASA after upgrade

Hi everybody thanks for a great forum.

I wasnt sure where to address this, but here goes

I upgraded an ASA 5505 (this is not a firewall question though) from 8.2(5) to 9.1(4). A leap of faith if you know what i mean hehe. Anyway, they have a CME with (in the 8.2 config) 2 nats one TCP and one UDP to 5060 (SIP). Right, it worked fine untill the upgrade ofcourse.

Now finally i got the voice part working, but only by removing one nat (the UDP). I cleared the xlate table and prepared some traces before i tested with a call to a number in there.

And what i saw kind of confused me a bit because the invite comes in over UDP(5060)... Even though i disabled the NAT statement for that?!

This is propably a silly question but how does that work. How can the invite get through to the CME when the NAT is gone? The other funny part is, if i disable the TCP NAT, and enable the UDP NAT it stops working entirely and all i get is a busy tone!

Then when i reenable the TCP NAT (i have to also disable the UDP NAT) i have to wait for a bit before it starts working again.

Hope you guys can shed some light over this.

Cheers everybody

1 REPLY

Voice flow through ASA after upgrade

Can you compare the ASA config before and after upgrade?

Check the presence of "inspect sip" and try to disable the inspection.

Regards.

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