© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Deployments Introducing Gateways

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Functionality Unified communication gateways connect IP communication networks to the PSTN or to a PBX Specifically, its role is the following: –Convert IP telephony packets into analog or digital signals –Connect an IP telephony network to analog or digital trunks or to individual analog stations

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Functionality (Cont.) Serve gateway protocols (H.323, MGCP, SIP, and SCCP) Provide advanced gateway functionality –DTMF relay –Supplementary services Work with redundant Cisco Unified CallManagers Enable call survivability Provide analog and/or digital interfaces to a PBX and the PSTN Provide fax or modem services, or both

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Example: Gateway Functionality IP WANPSTN San Jose Chicago MGCP Gateway H.323 Gateway Denver SIP Gateway

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Hardware Platforms Modern enterprise models: Cisco 2800 Series Cisco 3800 Series Cisco Catalyst 6500 Series

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Hardware Platforms (Cont.) Well-known and widely used older enterprise models: Cisco 1751-V EOS: 03/2007 EOL: 03/2012 Cisco 3600 Series EOS: 12/2004 EOL: 12/2008 Cisco 1760-V EOS: 03/2007 EOL: 03/2012 Cisco 2600XM Series EOS: 03/2007 EOL: 03/2012 Cisco 3700 Series EOS: 03/2007 EOL: 03/2012

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Hardware Platforms (Cont.) Special voice gateways: Cisco VG224 and VG248 Cisco AS5300 and AS5400 Series Cisco 7200 Series Cisco ATA 186 Cisco 827-4V EOS: 05/2005 EOL: 05/2010 Cisco AS5850

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Hardware Platforms (Cont.) H.323 Cisco Unified CallManager MGCP SIPSCCP Cisco 827-4VYesNo Cisco 2800 SeriesYes Cisco 3800 SeriesYes Cisco 1751-V / 1760-VYes NoYes 1 Cisco 2600XM SeriesYes NoNo 3 Cisco 3600 SeriesYes NoNo 3 Cisco 3700 SeriesYes NoNo 3 Cisco VG224Yes 2 NoYes Cisco VG248No Yes Cisco AS53XX / AS5400 / AS5850YesNo Communication Media ModuleYes GW Module WS-X6608-x1 and FXS Module WS-X6624 NoYesNoYes Cisco ATA 180 SeriesYes 2 NoYes 2 Cisco 7200 SeriesYesNo 1 Conferencing and transcoding only 2 FXS only 3 DSP farm

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Signaling Protocols H.323 umbrella Approved in 1996 by the ITU-T. Peer-to-peer protocol where end devices initiate sessions. Widely used with gateways, gatekeepers, or third-party H.323 clients, especially video terminals in Cisco Unified IP Communications. H.323 gateways are never registered with Cisco Unified CallManager; only the IP address is available to confirm that communication is possible.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Signaling Protocols (Cont.) Media Gateway Control Protocol (MGCP) IETF RFC 2705 developed in Client/server protocol that allows a call-control device to take control of a specific port on a gateway. For an MGCP interaction to take place with Cisco Unified CallManager, you have to make sure that the IOS/CatOS and the Cisco Unified CallManager version is compatible. MGCP Version 0.1 is supported with Cisco Unified CallManager. PRI backhaul concept is one of the most powerful concepts to the MGCP implementation with Cisco Unified CallManager. BRI backhauling is implemented in recent IOS versions.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Signaling Protocols (Cont.) Session Initiation Protocol (SIP) IETF RFC 2543 (1999), RFC 3261 (2002), and RFC 3665 (2003). Based on the logic of the World Wide Web. Widely used with gateways and proxy servers within service provider networks. Peer-to-peer protocol where end devices (user agents) initiate sessions. ASCII-text-based for easy implementation and debugging. SIP gateways are never registered with Cisco Unified CallManager; only the IP address is available to confirm that communication is possible.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Gateway Signaling Protocols (Cont.) Skinny Call Control Protocol (SCCP) Cisco proprietary terminal control protocol. Stimulus-protocolFor every event the end device sends a message to the Cisco Unified CallManager. Can be used to control gateway FXS ports. Proprietary nature allows quick additions and changes.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Comparing Signaling Protocols H.323 umbrella Peer-to-peer protocol Complex gateway configuration necessary because gateway must maintain dial plan and route pattern Examples: Cisco VG224 (FXS only), Cisco 2800, Cisco 3800 Q.931 Q.921 H.323 PSTN

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Comparing Signaling Protocols (Cont.) Media Gateway Control Protocol (MGCP) Client server architecture Simplified configuration Cisco Unified CallManager maintains the dial plan Examples: Cisco VG224 (FXS only), Cisco 2800, Cisco 3800 Non-IOS MGCP example: Cisco Catalyst 6000 WS-X6608-T1 and -E1 Q.931 Q.921 MGCP PSTN

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Comparing Signaling Protocols (Cont.) Session Initiation Protocol (SIP) Peer-to-peer protocol. Complex gateway configuration is necessary because the gateway must maintain a dial plan and route pattern. Examples: Cisco 2800 and Cisco 3800 series. Q.931 Q.921 SIP PSTN

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Comparing Signaling Protocols (Cont.) Skinny Call Control Protocol (SCCP) Client/Server architecture. Simplified configuration. Cisco Unified CallManager maintains a dial plan and route patterns. Examples: Cisco VG224 (FXS only), Cisco VG248, ATA 186, Cisco 2800 Series with FXS ports. FXS SCCP

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v IP-to-IP Gateways Next-generation unified IP communications gateways. Used to interconnect two independent networks. Single point of contact between networks. Proxies for signaling and RTP. Signaling protocols can vary on both sides. RTP SIP H.323 RTP

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v Summary Gateways connect Unified IP Communications networks to traditional telephony networks. There are several types of voice gateways to meet all kinds of customer needs, from small enterprises to large service provider networks. Cisco supports H.323, MGCP, SIP, and SCCP as gateway signaling protocols. MGCP and SCCP, used within Cisco Unified CallManager, simplify configuration on gateways as they operate in client/server mode instead of P2P mode as H.323 and SIP gateways do. IP-to-IP gateways are the next generation Unified IP Communication gateways that interconnect two different networks.

© 2006 Cisco Systems, Inc. All rights reserved.GWGK v