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Advanced SIP Functionality

This section describes advanced SIP functionality including the following:

Call Transfer Functionality

• REFER and NOTIFY Methods

• SIP Referred By Mechanism

• Host Generated Refer Message

• Refer-To Header Parameter Access

• SIP Subject Header in REFER

• Report REFER Request URI in PPL Event Indication

• Refer to Phone Number

• SIP Population of Status in Outbound NOTIFY Message

• SUBSCRIBE and NOTIFY Method for DTMF Detection

• SIP Notify Subscription State

• Programmable SIP URI Extensions

• Support for Request URI Parameters in SIP INVITE Messages

• PRACK Support

• Support for SIP INFO Message

• SIP Tunneling

• SIP Support for MIME

Call Agent Mode

• Outbound SIP Call with Call Agent Mode