175
Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Unified Communications on Cisco Integrated Services Routers
Unified Communications Gateways
TDM Gateways
The Cisco 3900 series and Cisco 2900 series ISRs support the following type of time-division
multiplexing (TDM) gateways:
• Voice Gateways, page 175
• Video Gateway, page 175
Voice Gateways
Cisco IOS voice gateways connect TDM equipment such as private branch exchanges (PBXs) and the
PSTN to VoIP packet networks. The Cisco ISR voice gateway routers support the widest range of packet
telephony-based voice interfaces and signaling protocols within the industry, providing connectivity
support for more than 90 percent of all PBXs and public-switched-telephone-network (PSTN)
connection points. Signaling support includes T1/E1 Primary Rate Interface (PRI), T1 channel
associated signaling (CAS), E1-R2, T1/E1 QSIG protocol, T1 Feature Group D (FGD), Basic Rate
Interface (BRI), foreign exchange office (FXO), ear and mouth (E&M), and foreign exchange station
(FXS). These voice gateway are highly scalable from just a few analog connections to up to 24 T1 or E1
interfaces.
The Cisco ISR series voice gateway routers can communicate with the Cisco Unified Communications
Manager using Session Initiation Protocol (SIP), H.323, or Media Gateway Control Protocol (MGCP).
The Cisco IOS voice gateway routers can also connect directly to other Cisco voice gateway routers
using SIP or H.323 and to various other VoIP destinations and call agents.
For more information, see ISDN Voice, Video and Data Call Switching with Router TDM Switching
Features at:
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00804794c6.shtml.
For details about tuning voice ports, see Cisco IOS Voice Port Configuration Guide, Release 12.4T at
Cisco.com at:
http://www.cisco.com/en/US/docs/ios/voice/voiceport/configuration/guide/12_4t/vp_12_4t_book.html.
Video Gateway
The Integrated Data, Voice, and Video Services for ISDN Interfaces feature allows multimedia
communications between H.320 endpoints and H.323, SIP, or Skinny Client Control Protocol (SCCP)
endpoints.
See Integrating Data, Voice, and Video Services for ISDN Interfaces at Cisco.com for details about
setting up a Video gateway (http://www.cisco.com/en/US/docs/ios/12_4t/12_4t11/h320gw.html.)
See Cisco IOS H.323 Configuration Guide, Release 12.4T at Cisco.com for details about the H.323
protocol (http://www.cisco.com/en/US/docs/ios/voice/h323/configuration/guide/12_4t/
vh_12_4t_book.html).
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