H.248

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Also known as Megaco, H.248 is a protocol for controlling media gateways via a [[Softswitch|softswitch]] or a [[Media gateway controller|media gateway controller]].
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Also known as Megaco, H.248 is a protocol for controlling media gateways via a [[Softswitch|softswitch]]/[[Softswitch|Media Gateway Controller (MGC)]].  
  
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<br>
  
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== TelcoBridges and H.248 ==
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== TelcoBridges and H.248 ==
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A version of [[Toolpack]] that supports the H.248 protocol is currently in development and is targeted for release in the first half of 2010. Further details will be provided at that time.
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[[Toolpack]] now supports the H.248 protocol.
  
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As indicated in the diagram below, the H.248 stack will be implemented as a module in the media gateway application residing on the application server. It will communicate with the various Toolpack classes (CAFClass, [[CMC library|CMC Library]], CMC Class) as required via a new [[CAF:_Working_With_Call_Legs|Media Leg API]]. In turn, the media gateway application will communicate with the softswitch / media gateway controller via the H.248 protocol.
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As indicated in the diagram below, the H.248 stack is a module in the media gateway application residing on the application server. It communicates with the various Toolpack classes (CAFClass, [[CMC library|CMC Library]], CMC Class) as required via a new [[CAF: Working With Call Legs|Media Leg API]]. In turn, the media gateway application communicates with the softswitch / media gateway controller via the H.248 protocol.  
  
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<br> [[Image:H.248 schematic.jpg|H.248 schematic.jpg]]
  
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[[Image:H.248 schematic.jpg|H.248 schematic.jpg]]
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<br>
  
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=== H.248 package support  ===
  
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=== Planned H.248 package support ===
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[[Toolpack]] supports the following packages.  
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Support for the following packages is currently in scope.
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*'''H.248.1'''
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*'''H.248.1'''  
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**Protocol v2
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**Protocol v2  
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**IPSec connection support
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**IPSec connection support  
 
**Support UDP (2944 or user-defined)
 
**Support UDP (2944 or user-defined)
  
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<br>
  
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*'''H.248.1 - Basic packages'''
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*'''H.248.1 - Basic packages'''  
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**Generic
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**Generic  
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**Base Root
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**Base Root  
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**Tone generator (for extension purposes only)
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**Tone generator (for extension purposes only)  
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**Tone detection (for extension purposes only)
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**Tone detection (for extension purposes only)  
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**Basic DTMF generation
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**Basic DTMF generation  
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**DTMF detection
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**DTMF detection  
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**Basic continuity package
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**Call Progress Tones Generator (Ringing, Busy, Congestion and Warning tones supported)
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**Basic continuity package  
 
**Network package
 
**Network package
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**RTP package
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**RTP package  
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**TDM Circuit package
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**TDM Circuit package (only echo-cancellation)
  
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<br>
  
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*'''H.248.13 Quality alert ceasing package'''
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*'''H.248.2 Facsimile, text conversation and call discrimination packages'''  
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**Quality alert ceasing package
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**Fax/TextPhone/Modem tones detection (fax and data only)
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**Call type discrimination package (fax and data only)
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**IP Fax (Event: Fax Connection Change - end of fax session, call terminating)
  
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<br>
  
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*'''H.248.2 Facsimile, text conversation and call discrimination packages'''
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*'''H.248.4 Transport over Stream Control Transmission Protocol (SCTP)'''
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**Fax/TextPhone/Modem tones detection (fax and data only)
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** Partial support
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**Call type discrimination package (fax and data only)
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<br>
  
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*'''H.248.7 Generic announcement package'''
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**Generic announcement package (Fix Announcement play only)
  
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*'''H.248.4 Transport over Stream Control Transmission Protocol (SCTP)'''
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<br>
  
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*'''H.248.10 Media gateway resource congestion handling package'''
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**Congestion handling package
  
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*'''H.248.6 Dynamic tone definition package'''
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<br>
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**Dynamic tone definition
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*'''H.248.11 Media gateway overload control package'''
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**Overload control package
  
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*'''H.248.7 Generic announcement package'''
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<br>
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**Generic announcement package
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*'''H.248.13 Quality alert ceasing package'''
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**Quality alert ceasing package
  
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*'''H.248.9 Advanced media server packages'''
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<br>
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**Advanced audio server base package
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**AAS Digit collection package
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**AAS Recording package
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*'''H.248.14 Inactivity timer package'''
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**Inactivity timer package
  
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*'''H.248.10 Media gateway resource congestion handling package'''
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<br>
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**Congestion handling package
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*'''H.248.16 Enhanced digit collection packages and procedures'''
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**Extended DTMF detection package
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**Enhanced DTMF detection package
  
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*'''H.248.11 Media gateway overload control package'''
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<br>
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**Overload control package
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*'''H.248.23 Enhanced alerting packages'''
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**Enhanced alerting package
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**Analogue Display Signalling package
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<br>
  
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*'''H.248.14 Inactivity timer package'''
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*'''H.248.25 Basic CAS packages'''  
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**Inactivity timer package
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**Basic CAS package
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**Basic CAS addressing
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<br>
  
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*'''H.248.27 Supplemental tones packages'''
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**Carrier tones generation package
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**Diagnostic tones generation package
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<br>
  
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*'''H.248.16 Enhanced digit collection'''
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*'''H.248.28 International CAS packages'''  
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**Extended DTMF detection package
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**International CAS
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**Enhanced DTMF detection package
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**CAS blocking
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<br>
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*'''H.248.29 International CAS compelled register signaling packages'''
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** Annex A.1 only in 'enbloc' compelled mode (International CAS Compelled package - No digitmap control: Digitmaps are preconfigured on MG)
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<br>
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*'''Q.1950 packages'''
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**Basic call progress tones generator package
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**Expanded call progress tones generator package
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**Basic services tones generator package
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<br>
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== Additional details  ==
  
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== Additional details ==
 
 
*Support for text mode only
 
*Support for text mode only
  
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== References ==
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== Configuration  ==
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*[http://en.wikipedia.org/wiki/Megaco Wikipedia article]
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*[[Toolpack:Protocol_Stack_Settings_D#H.248_MEGACO|Web Portal v3.0: H.248 Configuration]]
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*[[Toolpack:Protocol_Stack_Settings_C#H.248_MEGACO|Web Portal v2.10: H.248 Configuration]]
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*[[Toolpack:Protocol_Stack_Settings_B#H.248_MEGACO|Web Portal v2.9: H.248 Configuration]]
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*[[Toolpack:Protocol_Stack_Settings_A#H.248_MEGACO|Web Portal v2.8: H.248 Configuration]]
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<div class="mw-collapsible mw-collapsed" data-collapsetext="other versions" data-expandtext="Click here for other versions" style="width: 400px;">
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*[[Web_Portal_Tutorial_Guide_v2.7#H.248|Web Portal v2.7: H.248 Configuration]]
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*[[Toolpack_v2.5:Creating_an_H.248_Configuration|Configuring H.248 on TMG devices (v2.6 and before)]]
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</div>
  
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== References  ==
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*[http://en.wikipedia.org/wiki/Megaco Wikipedia article]
  
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[[category:Glossary]]
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[[Category:Glossary]]
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[[category:Needs revising]]
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[[Category:Tmedia_Features|H.248/Megaco]]
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[[Category:Revise on Major]]

Latest revision as of 14:44, 21 September 2020

Also known as Megaco, H.248 is a protocol for controlling media gateways via a softswitch/Media Gateway Controller (MGC).


Contents

TelcoBridges and H.248

Toolpack now supports the H.248 protocol.

As indicated in the diagram below, the H.248 stack is a module in the media gateway application residing on the application server. It communicates with the various Toolpack classes (CAFClass, CMC Library, CMC Class) as required via a new Media Leg API. In turn, the media gateway application communicates with the softswitch / media gateway controller via the H.248 protocol.


H.248 schematic.jpg


H.248 package support

Toolpack supports the following packages.

  • H.248.1
    • Protocol v2
    • IPSec connection support
    • Support UDP (2944 or user-defined)


  • H.248.1 - Basic packages
    • Generic
    • Base Root
    • Tone generator (for extension purposes only)
    • Tone detection (for extension purposes only)
    • Basic DTMF generation
    • DTMF detection
    • Call Progress Tones Generator (Ringing, Busy, Congestion and Warning tones supported)
    • Basic continuity package
    • Network package
    • RTP package
    • TDM Circuit package (only echo-cancellation)


  • H.248.2 Facsimile, text conversation and call discrimination packages
    • Fax/TextPhone/Modem tones detection (fax and data only)
    • Call type discrimination package (fax and data only)
    • IP Fax (Event: Fax Connection Change - end of fax session, call terminating)


  • H.248.4 Transport over Stream Control Transmission Protocol (SCTP)
    • Partial support


  • H.248.7 Generic announcement package
    • Generic announcement package (Fix Announcement play only)


  • H.248.10 Media gateway resource congestion handling package
    • Congestion handling package


  • H.248.11 Media gateway overload control package
    • Overload control package


  • H.248.13 Quality alert ceasing package
    • Quality alert ceasing package


  • H.248.14 Inactivity timer package
    • Inactivity timer package


  • H.248.16 Enhanced digit collection packages and procedures
    • Extended DTMF detection package
    • Enhanced DTMF detection package


  • H.248.23 Enhanced alerting packages
    • Enhanced alerting package
    • Analogue Display Signalling package


  • H.248.25 Basic CAS packages
    • Basic CAS package
    • Basic CAS addressing


  • H.248.27 Supplemental tones packages
    • Carrier tones generation package
    • Diagnostic tones generation package


  • H.248.28 International CAS packages
    • International CAS
    • CAS blocking


  • H.248.29 International CAS compelled register signaling packages
    • Annex A.1 only in 'enbloc' compelled mode (International CAS Compelled package - No digitmap control: Digitmaps are preconfigured on MG)


  • Q.1950 packages
    • Basic call progress tones generator package
    • Expanded call progress tones generator package
    • Basic services tones generator package


Additional details

  • Support for text mode only

Configuration

References

Retrieved from "https://docs.telcobridges.com/mediawiki/index.php?title=H.248&oldid=28956"
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