DTMF not correctly sent from SIP extension

[mem94043]

I have a SIP door phone set up on a MiVo250. Users can call from any Mitel IP phone extension to the door phone (SIP ext) and when it answers they  dial the 'relay' code (built-in to door phone) and it triggers just fine. However, if the door phone initiates a call to another Mitel IP extension and it answers, the door phone does not recognize any touch tones entered by the user on the IP phone.  So, I essentially have one-way DTMF working.  Any thoughts on what is causing this??  Thx!

[acejavelin]

Make sure your DTMF payload type (96 or 101 usually) is set the same in the SIP Peer Profile as it is in the device.