asterisk users - May 2009 - [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [DAHDI/1-1]

Im getting these messages when making calls from a sip extension/other asterisk
peer out my pri.

<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [DAHDI/1-1]
<< [ TYPE: Null Frame (5) SUBCLASS: N/A (0) ] [DAHDI/1-1]

It happens whenever i send dtmf.  I have all of my devices set to inband, be it
local peer, or remote asterisk box/peer. I googled for this error and only saw a
bug from 2005 about it, with rfc2833.

Any ideas where i may be going wrong?

Im running:
asterisk-1.6.0.9
asterisk-addons-1.6.0.1
dahdi-linux-2.1.0.4
dahdi-tools-2.1.0.2
libpri-1.4.9
spandsp-0.0.5
wanpipe-3.3.16

on Centos 5, with kernel 2.6.18-128.1.6.el5



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