Refer to the exhibit. The Greene Supply Company is integrating Cisco Unified CallManager Express into a SIP network. Which two statements are accurate?（）

• A、SIP support in dial peers is a Cisco IOS function. 
• B、Use the notify-based DTMF relay mechanism that is proprietary to Cisco.
• C、SIP support in Cisco IOS is a function of localized call processing integrated with Cisco Unity Express. 
• D、Use either the notify-based DTMF relay mechanism that is proprietary to Cisco or the RFC-based DTMF relay. 
• E、The SIP server must be configured for the E.164 numbers that are going to register with the Cisco CallManager Express database.