Setup firewall for onsip1/10/2024 However, SIP trunks are more complicated to establish than regular PSTN trunks. ![]() The service provider needs to configure an SIP Proxy Server. Customers need to set and configure CME, which is the PBX that will interpret the SIP signal adequately and pass traffic successfully. In order to access the IP network using a SIP trunk, it is necessary that configurations be made on the service provider, as well as on the customer side. In addition, SIP trunks permit the convergence of voice and data onto common all-IP connections. SIP trunks are similar to a phone line, except that SIP trunks use the IP network, not the PSTN. For this reason, Cisco has and continues to play an important role in taking a leadership to create new technologies that make SIP and its applications the standard of IP communications. SIP has great potential in transforming and developing the way people communicate. Also, SIP can handle conference sessions and broadcasts, as well as one-to-one sessions. SIP has rapidly emerged as the standard protocol used in IP communications, because it is a multimedia protocol that can be used for video sessions and instant messaging in addition to voice. SIP is an ASCII based, application-layer control protocol that can be used to establish, maintain, and terminate calls between two or more endpoints. Refer to the Cisco Technical Tips Conventions for more information on document conventions. If your network is live, make sure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on these software and hardware versions:Ĭisco 3825 Router on Cisco IOS Software Release 12.4(11)XJĬisco Catalyst 3550 Switch on Cisco IOS Software Release 12.4 Prerequisites RequirementsĮnsure that you meet these requirements before you attempt this configuration:Īn image of Cisco IOS ® Software Release 12.4(11)XJ or IOS 12.4(6th)T is on the routerĪn NM-CUE module is installed with CUE release 2.3.4 This document provides a description on SIP trunking and Cisco CallManager Express (CME), and a configuration to implement an IP-based telephony system with CME using SIP trunking for inbound and outbound calls. In order to avoid these problems, the IP PBXs use protocols for session initiation and management, the most prominent of which is Session Initiation Protocol (SIP). ![]() These successive translations increase the maintenance costs of the gateways, increases latency, and reduces voice quality. IP PBXs can access the PSTN using these types of trunks, but need a media gateway that converts the IP voice traffic to traditional PSTN, which sometimes can result in successive translation from IP domain to TDM domain. In order to connect to the PSTN, PBXs need some sort of trunking such as TDM (T1/E1) or analog lines. The usage of the TDM PBXs has decreased in the last couple of years, and the use of the IP PBX is becoming a good investment in IP LANs and WANs. IP PBXs are starting to predominate in the business of the Voice technology, and the TDM PBXs are no longer the primary source as the crossover going between two Voice networks. Figure 1 shows an IP telephony deployment trending towards IP trunking. These small and medium businesses are realizing that the use of IP is very efficient because IP can use Voice, Video, and Data capabilities over a single network, instead of using three separate special-purpose networks. The IP communication revolution has started to create a tremendous commercial impact in small and medium businesses. Today, the telecommunications industry is in the process of making the transition from long establishing switching and transport techonologies to IP-based transport and edge devices.
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