DTMF thru auto attendant

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VOIPisGreat:
When I dial out from the phone port on SP1, DTMF works fine.

When I dial out from the phone port on SP2, DTMF works fine.

When I dial in from a different phone to SP2 and have auto attendant answers then dial out on SP1, DTMF  doesn't work... even I tried all different DTMFmethod on both SP1 and SP2.

Help would be appreciated. Thanks!

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