Cisco Cisco IOS Software Release 12.4(4)T

SIP-to-SIP basic functionality for IP-to-IP gateway provides termination and reorigination of both 
signaling and media between VoIP and video networks using SIP signaling in conformance with 
RFC3261. The SIP-to-SIP protocol interworking capabilities of the Cisco Multiservice IP-to-IP 
Gateway support the following: 

Basic voice calls (G.711 and G.729 codecs) 

Calling/called name and number 

Codec transcoding (G.711-G.729) 

DTMF relay interworking 

Interworking between SIP Fast-Start and SIP early-media signaling 

Interworking between SIP Slow-Start and SIP delayed-media signaling 

RADIUS call-accounting records 

RSVP synchronized with call signaling 

T.38 fax relay and Cisco fax relay 

TCL IVR 2.0 for SIP, including media playout and digit collection (RFC 2833 DTMF relay) 

UDP and TCP transport 

Configuration information is included in the 

, 

Release 12.4T.

Command reference information is included in the 

The following commands are new or modified for this feature:

allow-connections 

An alphabetical list of all Cisco IOS Release 12.4T commands is in the Cisco IOS Master Commands 
List, Release 12.4T, at the following URL: