SIP in band DTMF with a Cisco 5510 ASA Problem

It was a dark and stormy night. Everything was running perfectly until the Cisco ASA was plugged in. Then it happened…

[color=blue][b]DTMF Gone Bad

Rated R[/b][/color]

They needed 80ms of in band DTMF on a SIP trunk. What they got is 15, 20, and 25ms DTMF in band. They isolated the problem to the Cisco 5510 ASA (v7) but when they Googled this they found that, alas, they were apparently the first to ever run into this monster.

Will an ASA guru have a suggestion that will save the day? Will they configure their way around this without pitching the Cisco ASA?

Be sure to follow this exciting story.

Thank you,

Ike