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DTMF tones only recognized with debugs on in gateway

Some analog phones were added to a VG224 and the DTMF tones are not recognized after the call is established.  I ran some debugs on the voice gateway and the tones were recognized.  when I turn the debugs off, the tones are not recognized.  I didn't believe it at first but I tested this several times, with debugs on, tones are recognized, with debugs off, the tones are not recognized.  Is this some bug?  Any idea what's going on here? Is there some other parameter that needs to be enabled?  Below is all the information.  Thanks

debug voip ccapi inout

VG224               vg224-i6k9s-mz.151-4.M5.bin

Voice Gateway 3945  c3900e-universalk9-mz.SPA.151-4.M2.bin

Gateway config in CUCM 8.5.1.15900-4   (H323 gateway)

SIP Trunk Security Profile   Non Secure SIP Trunk profile

DTMF Signaling Method        OOB and RFC 2833

voice port config in the VG

voice-port 2/9

timeouts ringing infinity

caller-id enable

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