No DTMF Relay to UC via PSTN (Testing AAR)

Hello All,

I am trying to access Voice Mail over PSTN during WAN Congestion (AAR).

Unity Connection not recognizing the password (no DTMF) when the call is routed as following during a high availability situation (AAR). 

SiteB PH2/PH3 --->  MGCP T1 Port of SiteB GW ----> My PSTN GW -----> SiteA H323 GW -----> CUCM PUB ----> Unity Connection.

*  The Unity Connection is playing Message -- Enter you PIN
*  Unity Connection recognizes SiteB PH2/PH3 is a registered user's number , so asks for password
*  When pressing password unity connection does not recognize that any key is pressed.

I am using Skinny integration of CUC to CUCM. Please let me know what I am missing.

Thanks,
Viki