I am using NOKIA 521. I found a strange issue with WiFi calling app. I am storing one of my conference bridge number along with its PIN, so I can join the conference without manually dialing in. This contact is working fine when I dial out using the cellular connection, but failing when dialed through the WiFi calling. The phone dials the conference number fine, then pauses based on the number of commas (,)s entered and then is dumping all digits in PIN(passcode) for the conference. In case of GSM connection dialing, the passcode is still transmitted properly to other end, but in WiFi calling, the other end is not able to understand the code.