MGCP and Megaco/H.248 are the Media Gateway Control Protocols defined by the IETF and ITU-T for use in distributed switching environments. (Megaco and H.248 are equivalent names for the same protocol, developed jointly between the IETF and the ITU-T; Megaco is the IETF name and H.248 is the ITU-T name.)
In such environments, signaling logic is located on Media Gateway Controllers (MGCs - also known as Call Agents or SoftSwitches) and media logic is located on Media Gateways (MGs). Using MGCP or Megaco/H.248, MGCs can control MGs to set up media (for example, voice traffic) paths through the distributed network.
The Megaco/H.248 protocol was developed from the MGCP Media Gateway Control Protocol. It provides broadly equivalent functionality and has a very similar structure. To take advantage of this similarity and to minimize duplication of code in devices that handle both MGCP and Megaco, Data Connection has developed the MGCP/Megaco Product Family covering both protocols: DC-MGCP for the MGCP protocol and DC-Megaco for the Megaco protocol. Each of the product family members comprises two components: a generic component that handles both protocols, and a protocol-specific component for that protocol. The two product family members can be run independently or together in the same device, depending on the protocol support required.
IMS Enabled
DC-Megaco/H.248 is an essential part of DCL's family of IMS solutions which include DC-SBC (P-CSCF, IBCF, BGF/I-BGF), DC-Diameter, and DC-SIP, which all support the required 3GPP, ETSI TISPAN, IETF, and ITU IMS standards.
The DC-MGCP and DC-Megaco/H.248 Product Features section below lists the most important features and functions of the DC-MGCP and DC-Megaco software. For details of the functions specific to each protocol, see DC-MGCP Protocol Function or DC-Megaco/H.248 Protocol Function. For more information about the architecture and interfaces of the DC-MGCP and DC-Megaco software, see the DC-MGCP/DC-Megaco Architecture page.
Data Connection's MGCP/Megaco Product Family
The DC-MGCP and DC-Megaco/H.248 software products are high function, flexible, portable protocol implementations which allow OEMs to quickly and easily build MGCP and/or Megaco/H.248 based products for
- residential gateways
- trunking gateways
- other media gateway devices
- Call Agents or SoftSwitches
- enhanced service platforms (such as IVR announcement servers).
DC-MGCP and DC-Megaco both consist of a core protocol stack implementation plus a toolkit that allows customization of the protocol support to match the level provided by the OEM application. This largely avoids the OEM application having to provide code for valid protocol messages that it does not support, as these can be rejected during parsing.
The DC-MGCP and DC-Megaco software products are implemented as libraries to allow them to be easily integrated into OEM environments.
DC-MGCP and DC-Megaco comply with the relevant Internet Engineering Task Force Megaco Working Group drafts and RFCs (including RFC 2705), ITU-T standards (including H.248) and other key standards (such as PacketCable/NCS). They also provide support for custom and OEM proprietary packages.
DC-MGCP and DC-Megaco run within Data Connection's portable, non-blocking, message passing execution environment - the N-BASE. The N-BASE
- minimizes the amount of engineering effort that is required to incorporate the products into an OEM device
- facilitates flexible distribution of product components across a wide range of hardware configurations from DSPs to line cards to specialized signaling processors
- incorporates sophisticated debug and diagnostics facilities that substantially ease the integration and subsequent maintenance of the products in an OEM environment.
Combined with Data Connection's High Availability Framework, this provides the performance, scalability and reliability required for the most demanding applications.
The DC-MGCP and DC-Megaco products support SNMP Management, and incorporate the relevant standard MIBs for easy integration with any SNMP agent software, including Epilogue and Emanate. Additionally, ASN.1 MIB definitions are provided to allow the products themselves to be configured and controlled through SNMP.
DC-MGCP and DC-Megaco/H.248 Product Features
The following lists the features supported in the DC-MGCP and DC-Megaco/H.248 software.
Common DC-MGCP and DC-Megaco/H.248 Product Function
- UDP transport support
- Fully extensible to support custom packages and parameters
- Fully customizable to allow unsupported parameters to be rejected or ignored
- MG and MGC support
- Modular architecture
- Full MIB management
- Extensive statistics
DC-MGCP Protocol Function
- Full MGCP 1.0 (RFC 2705) support
- Full PacketCable v1.0 support - PKT-SP-TGCP-I01-991201 and PKT-SP-EC-MGCP-I02-991201
-
Complete basic package support
- Generic Media
- DTMF
- MF
- Trunk
- Line
- Handset emulation
- Network Access Server
- Announcement Server
- Script
- RTP
-
PacketCable package support
- ADSI
- Line
- ISUP Trunk
- MF Termination
- MF FGD Operator Services
-
Other standard packages currently supported
- Basic PBX
- DTMF PBX
- MF Feature Group D
- Mailbox
- MF Single Stage Dialing Trunk
- Voice Mail
- ATM AAL2
DC-Megaco/H.248 Protocol Function
- Full H.248/Megaco v1, v2 & v3 functionality
-
Complete basic package support
- Generic
- Base Root
- Tone generator
- Tone detection
- Basic DTMF generator
- DTMF detection
- Call Progress Tones generator
- Call Progress Tones detection
- Analog Line Supervision
- Basic Continuity
- Network
- RTP
- TDM Circuit
- Segmentation
- Binary and text encoding support
- Full IPv6 support
- Stream level statistics
- TCP transport (with Interim AH Security)
- UDP transport using Application Layer Framing (ALF)
For more information about Data Connection's MGCP and Megaco/H.248 products and expertise contact dcmgcp@dataconnection.com.