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Dialogic PowerMedia HMP for Windows
Host Media Processing Software for Voice IP Solutions

Dialogic PowerMedia HMP for Windows

Dialogic Products
Media Server Software
Dialogic PowerMedia HMP for Windows
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Dialogic PowerMedia HMP for Windows (HMP Windows) is scalable, feature-rich media processing software for building innovative and cost-effective voice solutions suitable for enterprise or service provider deployment. HMP Windows can enable basic SIP or hybrid connectivity, audio play/record, transcoding, fax, automated interactive voice response (IVR), and high-end live interactions, such as contact centers and audio conferencing or speech portals. With HMP Windows, Dialogic brings decades of media processing and signaling development experience to a pure software media engine, allowing developers to transition many existing Dialogic hardware-based applications to software-based IP-enabled solutions, or create completely new interactive applications.

HMP Windows extends the capabilities of software-based IP media processing with security features that scale up to 5000 SIP signaling sessions or 2000 concurrent voice user sessions per system. HMP Windows runs on general-purpose servers without the need for specialized hardware. Along with virtualization support, this reduces total cost of ownership and provides greater efficiency and deployment flexibility. Adding Dialogic HMP Interface Boards (DNI Boards) allows PSTN connectivity in a “single box” solution with gateway functionality. Programming interfaces for HMP Windows include Dialogic R4 and Global Call APIs for low-level media and signaling control.


  • IVR and speech-enabled IVR
  • Voice announcement server
  • Voice mail server
  • Unified Messaging (Voice, Fax, Speech)
  • Audio Conferencing Server
  • Prepaid/debit card services
  • Contact center
  • Outbound dialing
  • Speech-enabled applications
  • Transcoding Server (TDM-IP, IP-IP, Voice, Video)
  • IP Media gateways
  • TDM/IP gateways
  • Converged PBX and IP-PBX

How PowerMedia HMP Windows Works

HMP Windows performs media processing tasks on general-purpose processors running on common server architecture without requiring specialized hardware. HMP Windows provides media services and functionality for building flexible, scalable, and cost-effective converged telephony applications, next-generation multimedia servers and gateway solutions for TDM, IP, 3G/4G wireless and IMS networks. HMP Windows is complimented by support for other Dialogic products and technologies, including:

  • Dialogic Global Call and R4 APIs — enables existing applications written for other Dialogic products (for example, board products) to move easily from TDM to IP and to HMP Linux.
  • Dialogic HMP Interface Boards (DNI Boards or Analog boards) — enables PSTN (T1/E1) connectivity in a variety of densities and 4-port Analog boards
  • Dialogic DSI SS7 Boards, Dialogic DSI Signaling Servers, and Dialogic DSI Protocol Stacks
    – provides TDM or IP SS7 interfaces using Global Call API for SS7 Signaling
    – supports single-server solutions, such as for pre-paid wireless and CRBT

Security Features

HMP Windows supports security features to encrypt media and signaling information for media transactions. Secure RTP (SRTP) provides encryption, message authentication, and integrity and replay protection to RTP data so that conversations cannot be stolen for later playback. Transport Layer Security (TLS) is available in SIP to protect signaling data so that dialing or keypad input information cannot be stolen.

Multimedia Features

When deployed in an IP network, HMP Windows supports the initiation and termination of a multimedia (audio/video) call, which includes SIPbased call control and H.263 video format. HMP Windows synchronizes voice and video streams for playback on IP video phones and videoenabled soft clients, and it can also deliver only the audio portion of a video call to an audio-only endpoint.

Easy Migration to Hybrid TDM-IP and Pure IP Solutions

HMP Windows uses the Ethernet Network Interface Card (NIC) typically present in host server platforms to enable IP connectivity, and supports the IETF RFC 3261 SIP standard for voice and video call session establishment.

When combined with Dialogic HMP Interface Boards (DNI Boards) for PSTN connectivity, HMP Windows provides a cost-effective platform for building TDM solutions, and then later migrating them easily to hybrid platforms, and ultimately to pure IP deployments. The DNI Boards are software-selectable T1 and E1 trunks supporting a range of PSTN protocols, including ISDN and CAS. Hybrid platforms can be deployed as IP media gateways, enhanced service platforms, or converged PBX solutions.

To help customers accelerate their time-to-market and migrate existing applications to IP, HMP Windows supports two direct APIs: the Dialogic R4 API for media processing and the Dialogic® Global Call API for call control. Because these APIs are consistent with the APIs for Dialogic boards with DM3 architecture, Dialogic customers can facilitate quick application development and easy migration from a board-based platform to a platform based on HMP Windows.


To provide interoperability for high-quality media streaming with a wide variety of IP gateways and endpoints that comply with IETF and ITU standards, HMP Windows supports RTP/RTCP protocols for streaming over IP using G.711, G.726, G.723.1, G.729, GSM-FR, GSM-EFR, AMR-NB, AMR-WB (G.722.2) and G.722.

To further provide high voice quality and low latency, HMP Windows supports:

  • Threshold alarms
  • Packet loss reduction/concealment
  • RTP and RTCP timeouts
  • Type Of Service (TOS) byte setting
  • Detection and reporting of timeouts in RTP and RTCP sessions to applications


Audio Conferencing features in HMP Windows facilitate the development of advanced conferencing applications. These features include:

  • Coaching and Whisper Conferencing
  • Active talker notification
  • Tone clamping
  • Echo cancellation

Other Notable Features

HMP Windows also includes the following notable features:

  • Support for HD Voice Messaging using wideband audio codecs G.722 and AMR-WB (G.722.2)
  • Ability to use Dialogic’s IP call control API or, at developers’ preference, to integrate another IP call control protocol stack
  • Ability to programmatically control the volume of RTP sessions in order to benefit the end-user experience
  • Support for a variety of media processing functions, such as:
    – Play with volume control
    – Record with Automatic Gain Control (AGC)
    – Dual-Tone Multi-Frequency (DTMF)
    – User-defined tone detection and generation, including industry-standard RFC 2833/RFC 4733 mechanisms
  • Support for outbound call progress analysis with positive voice detection and positive answering machine detection algorithms
  • Support for Dialogic Continuous Speech Processing (CSP) functionality with APIs that are compatible with Dialogic boards, allowing integration with Automatic Speech Recognition (ASR) engines
  • Support for fax store and forward for IP (T.38 and G.711 fax pass-through) and PSTN (V.17) networks.

Features and Benefits:

Features Benefits
Supports up to 2000 channels of G.711 RTP with voice play or record on COTS servers Allows high-density media processing on COTS servers
Applications scale according to processor performance, memory and co-resident application demands on the host server platform Allows for high density, cost-effective IP and TDM solutions that typically can support several thousand concurrent sessions
VMware ESXi Virtualization support Promotes low CAPEX, and deployment of communications solutions on virtual machines
Supports Dialogic HMP Interface Boards (DNI Boards) for T1/E1, and analog media boards (4 port) Enables converged solutions in enterprise and service provider environments with easy migration to pure IP platforms
Security support of SRTP and SIP TLS Provides encryption protection at the media layer with SRTP and at the signaling layer with TLS
Support for local Dialogic Global Call API for Call Control and Dialogic R4 API for Media R4 API and Global Call API allow easy migration of existing applications by providing compatibility at the API level with other Dialogic telecom products.
Conferencing features include coaching, active talker notification, tone clamping, echo cancellation, and scalability Facilitates development of advanced conferencing applications
Supports play, record, and synchronization of voice and H.263- format video in a multimedia stream that includes video I-frame detection to trigger start of record as well as transmit-of-tone notification when recording begins Enables media processing for video-based messaging and content delivery media servers


Applications developed on HMP Windows often serve as a voice or video IP Media Server, a network entity that terminates IP signaling and media connections in a network, which can be deployed differently in service provider and enterprise environments. Configurations for IP media servers that can be developed with HMP Windows include network announcement, IVR, voice mail, and conferencing server.

Service Provider Configuration

Figure 1 illustrates how an IP media server based on HMP Windows can be deployed in a typical service provider environment for IVR, announcements, voice mail/messaging, speech, or conferencing applications.

An IP-PSTN gateway terminates PSTN connections. A softswitch manages call establishment and teardown over IP. Once the call is established, an RTP connection is created between the IP media server and an endpoint. The softswitch tells the IP media server, IP endpoints, and IP-PSTN gateway when to establish or drop connections.

Figure 1. Dialogic PowerMedia HMP for Windows in a Service Provider Environment
Figure 1. Dialogic PowerMedia HMP for Windows in a Service Provider Environment

Enterprise Configurations

Figure 2 shows an example of how HMP Windows can be deployed in a media gateway or a converged PBX in an enterprise environment for IVR, video portal, auto attendant, voice mail, unified messaging, speech, or conferencing services.

Figure 2. Dialogic PowerMedia HMP for Windows in an Enterprise Environment
Figure 2. Dialogic PowerMedia HMP for Windows in an Enterprise Environment

Figure 3 provides a more detailed architectural view of the converged PBX element shown in Figure 2. HMP Windows presents the media and API to the application. It also controls the Dialogic HMP Interface Boards (DNI Boards) for T1 and E1 connectivity.

Figure 3. Dialogic PowerMedia HMP for Windows in a Converged PBX
Figure 3. Dialogic PowerMedia HMP for Windows in a Converged PBX


Technical Specifications
Channel Density Using G.711, a maximum of 2000 concurrent user sessions per system of voice, or 580 conferencing. A wide variety of other configurations that combine RTP streaming, voice, fax, speech, multimedia, and conferencing resources are also available, and the maximum number of concurrent sessions per system is configuration-dependent.
Network Interface
  • IP over an Ethernet NIC connection
  • Multiple NIC interfaces (for signaling or media)
Call Control over IP and TDM
  • SIP
  • Transport Layer Security (TLS)
  • Dialogic DSI SIGTRAN SS7 Stacks or TDM Dialogic DSI SS7 Stack running on DNI with combined SS7 / media, or the Dialogic DSI SS7 Boards, CAS, ISDN
  • Integration with third-party call and connection control stacks using the IP media library
Media Streaming over IP
  • IPv4, IPv6 (signaling)
  • RTP
  • RTCP
  • Secure RTP (SRTP)
Audio Codecs
  • G.711 A-Law, µ-law (10ms, 20ms, 30ms)
  • G.722
  • G.723.1
  • G.726
  • G.729a, G.729b, G.729ab
  • GSM-FR
  • AMR-NB AMR-WB (G.722.2)
  • Alarms
  • Frames per packet control
  • RTP/RTCP timeouts
  • Ability to modify the default DiffServe/TOS byte setting
Tone generation and detection
  • In-band DTMF
  • User-defined global tone generation and detection (GTG, GTD)
  • RFC 2833/4733
Media control over RTP Programmatic control of inbound RTP stream gain and outbound RTP stream volume
Voice Processing Features
Features supported Play, record, and tone generation and detection
Play Volume control and index play
Record Automatic Gain Control (AGC)
Audio file formats for play/record
  • OKI ADPCM 24K, 32K (vox and wav formats)
  • G.711 A-law, µ-law 48K, 64K (vox and wav formats)
  • Linear PCM 8b 11K (wav format only)
  • Linear PCM 8b 8K
Conferencing Features
Total parties per server 580
Advanced features
  • N-way summing
  • Coach/pupil mode
  • DTMF detection
  • DTMF clamping
  • Active talker notification
  • Automatic Gain Control (AGC)
  • Echo Cancellation (EC)
Voice Processing Features
Video Codecs H.263 (Baseline profile up to level 30)
Video image formats
  • Common Intermediate Format (CIF) PAL at 352 by 288 pixels,
  • Quarter Common Intermediate Format (QCIF) PAL at 176 by 144 pixels,
  • Sub-QCIF PAL at 128 by 96 pixels
Features supported
  • Play, Record
  • I-frame update (video fast update or VFU)
  • Playback of voice and video, voice only, video only
  • Synchronization of voice and video
Record Stores synchronized voice and video to a file
Multimedia file formats
  • Audio file (.wav/.pcm): Linear PCM 16b 8K
  • Video file (.vid): Dialogic HMP native codec format (H.263 bit-stream data)
API Support
Call control
  • Global Call API for TDM, SIP, Global Call Software for SS7 signaling
  • Third-party stack integrated via IP Media Library
Voice processing R4 voice (dx_)
IP media (RTP, QoS, etc.) R4 IPML (ipm_)
Conferencing R4 conferencing (cnf_)
R4 conferencing (dcb_)
Continuous Speech Processing R4 speech (ec_)
Fax R4 fax (fx_)
Multimedia R4 multimedia (mm_)
Virtual CT Bus routing R4 routing (sc_)
System Event reporting R4 SRL (sr_)
Virtualization Support
Hypervisors VMWare ESXi 5.x and 6.x
Supported Dialogic HMP Interface Boards (DNI Boards)
Network Interface (DNI Boards) Single, Dual, Quad and Octal T1/E1 Digital Network Interface (DNI) Boards
Analog Interface 4 Port Analog boards
Enabling methods Node-locked using FlexNet licensing utility
System Requirements
Processor Intel and AMD processors, including multi-processor, multi-core versions
Memory 8 GB or above recommended for voice applications; 16 GB or above recommended for high density applications
Disk Space 1 GB required for full installation of HMP Windows
IP-only solutions Multi-processor, multi-core platforms with an Ethernet NIC (Note: 1000Base-T recommended)
Converged solutions Multi-processor, multi-core PCI platform with an Ethernet NIC and Dialogic HMP Interface Boards (DNI Boards) or gateways
Operating System Requirements
HMP Windows is a standalone product and can function with the following operating systems
  • Windows Server 2012 R2
  • Windows Server 2012
  • Windows Server 2008 R2 (64-bit version)
  • Windows Server 2008 (32-bit and 64-bit versions)
  • Windows 8.1 Pro (32-bit and 64-bit versions)
  • Windows 7 (32-bit and 64-bit versions)


Download the Dialogic PowerMedia HMP for Windows Datasheet (.PDF)


Dialogic Products
Media Server Software
Dialogic PowerMedia HMP for Windows
Get a Quote!