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barcode scanner c# code project Figure 5-16 Examples of VoMPLS implementations in C#.NET
Figure 5-16 Examples of VoMPLS implementations Recognizing PDF 417 In C#.NET Using Barcode reader for VS .NET Control to read, scan PDF 417 image in .NET framework applications. www.OnBarcode.comDecoding PDF 417 In C# Using Barcode decoder for .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.comPOTS & VOP VOP POTS Trunk Nextgen DLC Trunk Call Agent Packet Router or Switch Call Agent Packet Router or Switch Trunk Bar Code Recognizer In C#.NET Using Barcode reader for Visual Studio .NET Control to read, scan barcode image in .NET framework applications. www.OnBarcode.comRecognizing Barcode In C# Using Barcode scanner for VS .NET Control to read, scan read, scan image in VS .NET applications. www.OnBarcode.com Five
PDF 417 Scanner In C# Using Barcode scanner for Visual Studio .NET Control to read, scan PDF-417 2d barcode image in VS .NET applications. www.OnBarcode.comPDF 417 Scanner In .NET Using Barcode reader for ASP.NET Control to read, scan PDF 417 image in ASP.NET applications. www.OnBarcode.comMPLS Packet Network
Decoding PDF-417 2d Barcode In .NET Using Barcode scanner for .NET framework Control to read, scan PDF-417 2d barcode image in .NET framework applications. www.OnBarcode.comPDF-417 2d Barcode Scanner In Visual Basic .NET Using Barcode decoder for VS .NET Control to read, scan PDF-417 2d barcode image in .NET applications. www.OnBarcode.comPOTS & VOP Nextgen DLC VOP POTS Trunk
Recognizing 2D Barcode In Visual C# Using Barcode decoder for .NET Control to read, scan Matrix Barcode image in VS .NET applications. www.OnBarcode.comScanning Data Matrix In C#.NET Using Barcode scanner for .NET Control to read, scan DataMatrix image in .NET applications. www.OnBarcode.comSS7 Network
Barcode Decoder In C# Using Barcode decoder for .NET framework Control to read, scan barcode image in Visual Studio .NET applications. www.OnBarcode.comReading PDF 417 In C# Using Barcode recognizer for Visual Studio .NET Control to read, scan PDF-417 2d barcode image in VS .NET applications. www.OnBarcode.comE911 USD - 8 Recognizer In C# Using Barcode recognizer for .NET framework Control to read, scan Code11 image in .NET applications. www.OnBarcode.comCode 3 Of 9 Recognizer In Visual Basic .NET Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.comClass-4 Switch
Barcode Scanner In .NET Framework Using Barcode reader for Reporting Service Control to read, scan barcode image in Reporting Service applications. www.OnBarcode.comDecode Code-39 In None Using Barcode scanner for Software Control to read, scan Code 39 image in Software applications. www.OnBarcode.comClass-4 Switch
PDF 417 Scanner In None Using Barcode decoder for Software Control to read, scan PDF417 image in Software applications. www.OnBarcode.comRecognize Bar Code In None Using Barcode scanner for Software Control to read, scan bar code image in Software applications. www.OnBarcode.comE911 UPC-A Supplement 5 Decoder In Visual Studio .NET Using Barcode recognizer for Reporting Service Control to read, scan UPCA image in Reporting Service applications. www.OnBarcode.comReading ANSI/AIM Code 128 In Objective-C Using Barcode scanner for iPhone Control to read, scan Code 128B image in iPhone applications. www.OnBarcode.comTandem Network
Gatekeeper
Gatekeeper
POTS & VOP VOP POTS TR-008/ GR-303 Nextgen DLC DS-1, DS-3, OC-3 Packet Router or Switch
Packet Router or Switch DS-1, DS-3, OC-3 Nextgen DLC
MPLS Packet Network
POTS & VOP VOP POTS TR-008/ GR-303 Class-5 Switch PSTN
Class-5 Switch
Top: ILEC-bypass (by IXC) Bottom: ILEC deployment
said they had committed plans to deploy softswitches, and 666 percent of interoffice channels (IOCs) with 20,000 to 100,000 lines said they had committed deployment plans Among those who have deployed softswitches, the most popular applications cited were creating Internet offload (29 percent), replacing Class 4 switches (26 percent), and expanding revenue (19 percent) Among those not deploying softswitches, two of the more common reasons cited were that there was no compelling business reason to change and there were concerns about poor voice quality Some also said they still have a number of years to depreciate their current switches Motivations, Drivers, Approaches, and Advantages of VoMPLS
55 Outline of Work Underway That Is Needed for VoMPLS/VoIPoMPLS
This section highlights work efforts and issues that have been identified by standards-making bodies, particularly the IETF, for VoMPLS/VoIPoMPLS1 A VoIPoMPLS (vompls) Working Group has been proposed to define a framework for the operation of VoMPLS and identify requirements for possible extensions to existing protocols to support this application The Working Group would serve as a forum for discussing VoIPoMPLS technology integration issues Deliverables should include I I I I
VoIPoMPLS framework and informational Request for Comments (RFC) Mapping voice service definitions and packet transport performance requirements to MPLS and informational RFCs VoIPoMPLS call and device control protocol requirements, and informational RFCs VoIPoMPLS QoS/GoS parameter usage/requirements, best current practice (BCP), and RFCs The consensus of the developers is that you should not attempt to modify application protocols (such as SIP, H323, and so on) to talk to the MPLS layer The idea is to keep a level of abstraction in the application layer (it should not know what technology it is running over) Any signaling should be asking for QoS, not specific implementations of QoS The latter would be too constraining for growth Some developers have considered adding circuit emulation in VoIPoMPLS/VoMPLS However, with the publication of PW documentation9 (see Section 57), circuit emulation can be relegated to these other technologies 551 Definition of VoIPoMPLS
VoIPoMPLS involves the use of MPLS as the efficient transport of VoIP services with predictable QoS/GoS in an IP/MPLS network 552 Approach
The desirable approach is to attempt to build VoMPLS on the work already done for VoIP For example, you could use existing call/device control Five
protocols (such as MEGACO, MGCP, H323, and SIP these are discussed in 7, Signaling Issues for Voice over MPLS ), existing voice encapsulation (such as RTP), and the existing IP over MPLS mechanisms along with existing signaling protocols (CR-LDP and RSVP-TE) The IETF has shown preference for having standard mappings of VoIP and IP over MPLS However, further work is necessary to combine call control and MPLS transport, including the exact details of mapping voice service requirements to MPLS The Internet Draft draft-kankkunen-vompls-fw01txt (covered in the next section) provides a VoMPLS framework that can be utilized as a starting point In general, VoMPLS needs to be signalingprotocol agnostic (both in terms of the MPLS signaling and the H323/ MGCP/SIP signaling The framework defines voice service requirements, but you want to avoid defining new protocols, if possible The VoIPoMPLS reference model10 (called VoMPLS by the authors of the draft, but it is really a VoIPoMPLS model) encompasses the following elements: I I I I I I
Intelligent endpoints (SIP phones and so on) Decomposed gateways Call agent Media gateways (MGs) MGCP/MEGACO Various gateways such as Trunk gateway (TG) MPLS trunk-side PSTN (IMT with SS7) Access gateway (AG) Line-side gateway (LSG) Integrated Access Device (IAD) Signaling gateway (SG) Single customer voice and data with Plain Old Telephone Service (POTS)/T1, channel associated signaling (CAS), and Integrated Services Digital Network (ISDN) signaling Multiple customer voice and data POTS/T1/E1/T3/E3 time-division multiplexing (TDM) with POTS, CAS, or ISDN The signaling PDUs are expected to go over MPLS, but they would use normal IP over MPLS encapsulation The framework in question only focuses on the transport Data-plane requirements are as follows: Provide a transparent path for VoIP bearers (RTP) Provide efficient transport (header compression)
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