VoIP (SIP 5060UDP etc.) and Watchguard Firebox II - has anyone achieved this?

We have tried several VoIP ATA's behind a Firebox II with a whole range
of rules in the firebox but cannot get past the 5min32sec NAT dropout
issue.

That is, the Firebox terminates the NAT session after 5 minutes 32
seconds and the call (UDP - RTP) drops out.

Would love to hear your feedback. (And yes, we know we should just
replace the retired firebox - but can't in this case.)

Re: VoIP (SIP 5060UDP etc.) and Watchguard Firebox II - has anyone achieved this?

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