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SB.CCM createAnswer: Maximum number of T.38 calls or PLC/VAD already running

The TA is rejecting T.38 requests due to "SB.CCM createAnswer: Maximum number of T.38 calls or PLC/VAD already running".  There are no other fax or modem calls active.  What would cause this?

Here's the MGCP endpoint config:

 

voice mgcp-endpoint 9
 codec-group All_Codecs
 connect fxs 0/9
 no echo-cancellation
 modem-passthrough
 no nls
 t38

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