Cisco Unified Communication Voice Gateway

The current communication methods are inseparable from the IP network. To combine the two, you must use the gateway. Now let's talk about the knowledge of Cisco's unified voice gateway. Which models are available in these products, and what are the differences between these models?

Cisco Unified Communication Voice Gateway

Cisco 1700, 2600XM, 2800, 3700 and 3800, and Cisco Catalyst? The 5000 Series Voice Gateway Router uses SIP to terminate a call and convert the call signal between the PSTN and the IP network. Applications of this function include PBX interconnection, SIP relay, IP Centrex, and home speech service. These Cisco SIP gateways fully comply with IETF standards and can be shared with call agents of Cisco and other vendors. Cisco Voice Gateway also supports H.323, MGCP, and protocol interoperability.

Cisco Session boundary Controller

As customers build more complex voice and video networks, session boundary controller SBC is becoming an important network component. SBC can help customers integrate interconnection points, provide and implement QoS indicators, and implement protocol interoperability such as H.323 and SIP), and provide more secure connections for remote calls. Cisco multi-service IP-to-IP gateway is a Cisco IOS software session boundary controller product that can be used to expand the SIP function and enhance the termination and re-initiation features of call streams following the sip rfc standard.

For custom applications, Cisco multi-service IP-to-IP gateway software supports the Cisco uniied CallManager 5.0 feature and the tool command language TCL) and speech Extensible Markup Language VXML ). These custom applications can execute signaling and call termination and re-launch functions, such as long-talk license codes.

In the future, the Cisco IOS software session boundary controller will support network address translation (NAT). This new feature allows you to Hide IP addresses in a SIP message without any configuration on a remote gateway.

For details about Cisco Unified Communication between multiple service IP addresses and IP gateways, visit: www.cisco.com/go/voice.

Cisco Unified Communication Security Solution

As a dating protocol, devices can communicate without having to establish a security relationship in advance. SIP poses a new challenge to network security. In addition, SIP also needs to process different trust policies between different intermediate devices and terminals.

The SIP security feature provided for Cisco products in the Unified Communication System is a natural extension of Cisco's self-defense network strategy, which provides an integrated, collaborative, and adaptive security mode, make the network respond to new threats. Currently, security features in Cisco IOS software, Cisco PIX heavy security devices, and security modules on Cisco switches and routers can provide protection for many IP voice VoIP protocols, including SIP.

In addition, Cisco products in the Unified Communication System also support SIP-specific security features. HTTP Digest verification features on Cisco 1700, 2600XM, 2800, 3700 and 3800, Cisco Catalyst 5000 Series Voice Gateway routers, Cisco uniied CallManager Express, proxy servers, and SIP phones, supports SIP verification. Cisco Remote Party id rpid) features provide detailed identity information of the caller in the RPID header.

Cisco uniied CallManager and Cisco uniied IP Phones also support call stream and messaging encryption, using secure real-time transmission protocol SRTP) and Transport Layer Security TLS) to achieve the confidentiality and integrity of voice sessions. Cisco Unified IP Phones use digital signatures to protect IP Phone software against configuration tampering.

For a detailed White Paper on Cisco Unified Communication SIP security, visit: www.cisco.com/go/ipcsecurity.