Cisco Cisco IOS Software Release 12.4(4)T

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RFC 2833 Dual-Tone Multifrequency Media
Termination Point Passthrough

The RFC 2833 Dual-Tone Multifrequency (DTMF) Media Termination Point (MTP) Passthrough feature
passes DTMF tones transparently between Session Initiation Protocol (SIP) endpoints that require either
transcoding or use of the RSVP Agent feature. (An RSVP agent is a Cisco IOS-based Resource
Reservation Protocol [RSVP] proxy server that registers with the call manager—Cisco Unified
CallManager or Cisco Unified CallManager Express—as a media-termination point or a transcoder
device.)

Configuration Information

Configuration information is included in the “Configuring SIP DTMF Features” module of the Cisco
IOS SIP Configuration Guide, Release 12.4T,

at the following URL:

http://www.cisco.com/en/US/docs/ios/voice/sip/configuration/guide/sip_cg-dtmf_ps6441_TSD_Produ
cts_Configuration_Guide_Chapter.html#wp1062375

Command Reference Information

Command reference information is included in the Cisco IOS Voice Command Reference, Release 12.4T,
at the following URL:

http://www.cisco.com/en/US/docs/ios/voice/command/reference/vr_book.html

List of All Release 12.4T Commands

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:

http://www.cisco.com/en/US/docs/ios/mcl/124tmcl/124t_book.html

List of All New, Modified, Removed, and Replaced Release 12.4T Commands

Alphabetized lists of all new, modified, removed, and replaced commands for each Cisco IOS
Release 12.4T release are in the Cisco IOS New, Modified, Removed, and Replaced Commands,
Release 12.4T, document at the following URL:

http://www.cisco.com/en/US/docs/ios/mcl/124tmcl/124t_nml.html