We are in the process of installing a SIP phone on one of our gates. The SIP is registered with the 3300 and can be dialed and can dial out. When you press the call button it calls an extension and the user presses *11* to open the gate. The SIP phone does not recognize the DTMF tones. The vendor says the DTMF outband has to be RFC2833. How do I determine that on the 3300 on release 6.0? I have changed some of the SIP device capabilities and had no luck.
