Cisco Cisco IOS XE Software Release 2

Configurable SIP Parameter Modification

DTMF Events Through SIP Signaling

Enhanced SIP REFER

H.323 to SIP Supplementary Feature Interworking for Session Border Controller (SBC)

iLBC Support for SIP and H.323

IP-IP Gateway for H323 Call Manager to H323 Service Provider Connectivity

IP-to-IP Gateway: SIP-SIP Basic Functionality

SIP - Ability to Send a SIP Registration Message on a Border Element

SIP - Configurable Hostname in Locally Generated SIP Headers

SIP - Core SIP Technology Enhancements

SIP - DNS SRV RFC2782 Compliance

SIP - Enhanced 180 Provisional Response Handling

SIP - Gateway Support for the Bind Command

SIP - INFO Method for DTMF Tone Generation

SIP - Session Initiation Protocol for VoIP

SIP - Session Timer Support

SIP - SIP Basic Feature Functionality for Session Border Controller (SBC)

SIP - SIP Extended Feature Functionality for Session Border Controller (SBC)

SIP - SIP GW Session Timer Support

SIP - Stack Support of TLS

SIP - Support for SESSION REFRESH with reINVITEs

SIP and TEL URL Support

SIP to SIP Supplementary Services for Session Border Controller (SBC)

SIP:SIP Support for Options

Support for negotiation of an audio codec from a list of codecs on each leg of a SIP-SIP call on the 
Cisco Unified Border Element

Transparent Tunneling of QSIG and Q.931 over SIP-SIP Cisco Unified Border Element