This document addresses how the protocol functions and how it is implemented in cisco callmanager. Mgcp grew out of two other protocolsthe internet protocol device control ipdc and the simple gateway control protocol sgcp. Informational january 2003 media gateway control protocol mgcp version 1. Introduction this document provides implementation guidelines for the use of return codes in the media gateway control protocol mgcp 1. The media gateway control protocol mgcp was first described in rfc 2705, and revised in rfc 3435. We expect that, in the future, the same gateways will combine voice over ip services. This happens when call control devices use a plaintext protocol, mgcp, to manage ip telephony gateways. Media gateway control protocol mgcp fundamentals provides indepth coverage of voip and mgcp.
Media gateway control protocol mgcp, commonly known as h. This document describes an application programming interface and a corresponding protocol mgcp which is used between elements of a decomposed multimedia gateway. Implementing mgcp gateways media gateway control protocol. Rfc 2705 media gateway control protocol mgcp version 1. Asynchronous transfer mode atm package for the media gateway control protocol mgcp. May 18, 2006 the cisco 7960 ip phones in this example use the skinny call control protocol sccp to communicate with the cisco callmanager. Routing multicasting multiprotocol label switching mpls. It contains recommendations on software architecture as well as platform and system applicability of the xom gateway control protocol xgcp. The design of enterprise voip mgc based on mgcp protocol. Session initiation protocol sip is an applicationlayer signaling protocol for creating. After you select the gateway type, the only option available under device protocol is mgcp. Media gateways controllers control media gateways by means of a media gateway control protocol. Initiation protocol sip, media gateway control protocol mgcp, and h.
It implements the media gateway control protocol architecture for controlling media gateways connected to the public switched telephone network pstn. Internet telephony department of computer science, columbia. The media gateway controller protocol mgcp is specified in drafthuitema mgcp v0r100. Learn what mgcp is and how it works, and get a practical guide on how to use it. Media gateway control protocol mgcp is a protocol used for controlling voice over ip voip gateways from external call control elements. The media gateway control protocol mgcp is a signaling and call control communications. The media gateway control protocol mgcp emerged from a group now called the.
User data is interspersed inband with telnet control information in an 8bit byte oriented data connection over the transmission control protocol tcp. Pdf media gateway control protocol architecture and requirements. Pickett vertical networks october 1999 media gateway control protocol mgcp version 1. The methodology of mgcp reflects the structure of the pstn with the power of the network residing in a call control center softswitch much the same as the central office in the telephone network.
This document defines the protocol used between elements of a physically decomposed multimedia gateway, i. Mgcp ietf rfc 2705 is a masterslave protocol that allows a call control device cucm to take control of a specific port on a gateway. The media gateway control protocol mgcp is defined by rfc 2705. Mgcp defined under rfc 2705 is a masterslave protocol that allows a call control device such as cisco callmanager to take control of a specific port on a gateway.
Media gateway call agent uses mgcp to establish and control media sessions with other multimedia endpoints. The media gateway control protocol architecture and its methodologies and programming interfaces are described in rfc 2805 mgcp is a masterslave protocol in which media gateways mgs are controlled by a call control agent or softswitch. Mgcp is the emerging protocol that is receiving wide interest from both the voice and data industries. The entire control intelligence is controlled by a master who instructs the endpoint what action to take once an event is detected. Gateway control protocol including mgcp, sgcp and ipdc listed as xgcp. Media gateway control protocol mgcp created 20020930 last updated 20080327 available formats xml html plain text. With the network protocol it can control each specific port on a media gateway. Rfc 2705 media gateway control protocol mgcp october 1999 2. It does not specify an internet standard of any kind.
Session initiation protocol an overview sciencedirect topics. The actual voice data is transferred through realtime transport protocol rtp directly between the two devices. Mgcp media gateway control protocol a command based protocol for the delivery of information between mgc media gateway controller and mgw media gateway. Understanding mgcp interactions with cisco callmanager. Return codes in 1 do not cover all possible specific situations that may ever occur in the gateway. The media gateway control protocol mgcp is described in a series of internet engineering task force ietf drafts and informational rfcs and was standardized by the itut. Mgcp, or media gateway control protocol is a protocol used within a distributed voice over ip system. Media gateway controller protocol mgcp session helper mgcp. We expect that in the future, the same gateways will combine voice over ip services and network access services. Ietf merged mgcp and mdcp and proposed a new and improved protocol named megaco protocol also known as h.
Note that these are logical entities, and that vendors of ims infrastructure equipment may combine some of these entities on the. The media gateway controller is the master server, and one or more media gateways are the slave clients that behave like simple switches. Mgcp defined under rfc 2705 is a masterslave protocol that allows a call control device such as. Media gateway control protocol gateways cisco unified. Media gateway control protocol mgcp the wireshark wiki. The protocol presented in this document meets the requirements for a media gateway control protocol as presented in rfc 2805. Media gateway control protocol mgcp package registry. Mgcp is a textbased protocol consisting of commands and responses. Media gateway control protocols specify a masterslave architecture for decomposed gateways. Media gateway controller protocol mgcp session helper mgcp the media gateway control protocol mgcp is a textbased application layer protocol used for voip call setup and control. It is a very simple protocol that utilizes sdp and has become the defacto standard for media gateway control worldwide. Rfc 3661 media gateway control protocol mgcp return code. The protocol defines a means of communication between a media gateway, which converts data from the format required for a circuitswitched network to that. Notifications request, notification, create connection.
The dialogic controlswitch system is an imsready media gateway control function mgcf ngn class 4 softswitch that provides a smooth migration path from existing tdm voice networks to the nextgeneration networkip multimedia subsystem ngnims by enabling the interconnection of a mix of traditional and ims sipbased voice networks. Mgcp gateways are divided into residential gateways and trunking gateways. This controller is called a media gateway controller mgc or call agent ca. Gateway control protocol including mgcp, sgcp and ipdc how. Control protocol between a media gateway controller and a media. Pdf this document describes protocol requirements for the media gateway control protocol between a media. The advantage of this is that it creates a centralized gateway administration and provides for largely scaleable. Mgcp is used by the cisco callmanager only to control the gateway.
What is a little different is that with media gateway control protocol, the structure of the masterslave relationship places the control firmly with the media gateway controller. Cisco bliss solutions combine proven network components and structured. It provides abstraction of the gateway control protocol gcp interface to these components as well as providing a basis. It is gateway control protocol including mgcp, sgcp and ipdc. Capture only the mgcp traffic over the tcp port 2427. Media gateway control protocol architecture wikipedia. Media gateway control protocol mgcp, also known as h. Media gateway communications protocol is used to implement a network element that provides conversion between the audio signals carried on telephone circuits and data packets carried over the internet or over other packet networks. Media gateway control protocol mgcp and megaco 2 mgcp and megaco. Rfc 3435 media gateway control protocol mgcp version 1. Mgcp uses a masterslave call control architecture in which the media gateway controller uses a call agent to maintain call control intelligence, while the. The decomposed multimedia gateway consists of a call agent, which contains the call control intelligence, and a media gateway which contains the media functions, e. Mgcp is a masterslave protocol, where the endpoint slave is controlled by a call agent master of some type. This has the advantage of centralized gateway administration and provides for largely scalable ip telephony solutions.
Application signaling and device control session description protocol sdp realtime streaming protocol rtsp session initiation protocol sip media gateway control protocol mgcp 6. Elements of both internet protocol device control and simple gateway control protocol are found in the mix for mgcp. Media gateway control protocol mgcp mgcp1 mgcp gateways between ip telephony and pstn. Mgcp is a media gateway control protocol specified in rfc 3435. Voice over ip voip uses the internet protocol ip to transmit voice as.
Bellcore announce merger of protocol specifications for voice over ip. This merger combined the best features of each protocol into a single entity. Media gateway control how is media gateway control abbreviated. The media gateway control protocol architecture is a methodology of providing. The media gateway control protocol mgcp bulk audit package. Jul 10, 2019 mgcp is a plaintext protocol used by call control devices to manage ip telephony gateways. The media gateway control protocol mgcp is a signaling and call control communications protocol used in voice over ip voip telecommunication systems. Informational page 1 rfc 2705 media gateway control protocol mgcp october 1999 the interface section presents a conceptual overview of the mgcp, presenting the naming conventions, the usage of the session description protocol sdp, and the procedures that compose mgcp. Because ipdc and sgcp were redundant, the two camps merged the protocols to form the media gateway control protocol mgcp. Media gateway control protocol mgcp package registry created 20020930 last updated 20625 available formats xml html plain text. Mgcp is designed to interface a media gateway controller and media gateway.
Media gateway control protocol architecture wikiwand. For example, in mgcp a call can use an endpoint mode conference to manage the stream mixing, but it cannot achieve the fine grain control of h. Mgcp has the advantage of centralized gateway administration and provides for scalable ip telephony solutions. For an mgcp gateway, choose the device type, such as router model or vg type. Media gateway control protocol mgcp fundamentals tonex. Test suite includes inbuilt scripts, which tests the functionality of the media gateway for mgcp protocol valid and invalid behaviour. Notice that you cannot configure callmanager to recognize the same device as both an mgcp and an h. Introduction this document describes an abstract application programming interface mgci and a corresponding protocol mgcp for controlling media gateways from external call control elements called media gateway controllers or call agents. It also leverages ipdcs superior event handling and extensibility features.
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