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

Support SIP Max Forward in INVITE Message

PRACK Support

Support for SIP INFO Message

SIP Tunneling

SIP Support for MIME

Call Agent Mode

Outbound SIP Call with Call Agent Mode