Configuration
 
TDM400 port <=> * <=> sip phone
 
When I make a connection between these phones the TDM400 can hear the SIP phone just fine and the SIP can hear the TDM400 port just fine most of the time.  But sporadically you can not hear the TDM400 on the SIP phone it sounds like the microphone on the TDM400 port goes hypersensitive and it is like you are overdriving the microphone on the TDM400 and it has a lot of distortion.  You can hear it on both sides.  The SIP conversation is still good on the TDM400 but the TDM400 conversation on the sip phone is distorted and unusable.
 
Tried several different ports on the TDM400, tried different codecs.  All the same story.
 

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