When I tried to set the variable dtmf_type=info, or in sip profile parameter dtmf-type=info, would FS send the SIP INFO packet.
For instance, if I called an IVR and pressed 2 after the call got answered by the IVR, I was expecting to see the message similar to below, but I did not see it.  
Is there any other variables that needs to be set?


INFO sip:2143302100@172.17.2.33 SIP/2.0
Via: SIP/2.0/UDP 172.80.2.100:5060
From: <sip:9724401003@172.80.2.100>;tag=43
To: <sip:2143302100@172.17.2.33>;tag=9753.0207
Call-ID: 984072_15401962@172.80.2.100
CSeq: 25634 INFO
Supported: 100rel
Supported: timer
Content-Length: 26
Content-Type: application/dtmf-relay

Signal= 2
Duration= 215


Thank you.