SIP-QSIG Signaling Interworking

A good SIP to QSIG Gateway software design kit will translate the packetized signaling messages on IP networks to the  messages used on the digital QSIG networks, and is an ideal solution for OEMs developing embedded gateways and adapters.

SIP-QSIG Signaling Interworking Features

  • SIP User Agent software SIP Stack
  • World-wide QSIG software Signaling Stack
  • SIP-QSIG software Interworking Module
  • Robbed Bit Signaling stack
  • IETF & ITU Standards-based software
  • Processor and RTOS independent software
  • Written in ANSI C source code for ease of portation
  • Developed for embedded applications

SIP-QSIG Signaling Interworking applications

An embedded SIP to QSIG gateway should have the following features: 

  • Compliant with RFC 4497 -- Interworking between the Session Initiation Protocol (SIP) and QSIG
  • Handles basic call setup and teardown between SIP and PSTN
  • Relays provisional responses
  • Absorbs overlap dialing on PSTN side
  • Reliable provisional responses provide early media connections
  • API provides notification of necessary codec information for single or dual codecs
  • API allows complete customer control of dialing plan and PSTN <-> SIP URI translations

Small Gateway SIP-QSIG applications:

The small RAM and ROM footprint ofan embedded software development toolkit means that you can save memory.  And the fast execution speed allows use of a slower processor;  fewer instruction cycles means that the processor can "sleep" more thereby lowering power requirements. 

Large Gateway SIP-PSTN applications:

The low per-call memory requirement of a carrier-class SIP-PSTN gateway means that you can save a significant amount of memory when your gateway services thousands and tens of thousands of calls.  And the fast execution time results in more calls per MIPS, or in lower power requirements for a given number of calls.  This translates into lower power requirements for your system, less heat generated by the processor, lower air conditioning requirements--in short, better NEBS performance.

These devices may VoIP-enable a standard PBX, or allow a network of VoIP phones and VoIP softphones connected to an IP PBX or router to interwork calls to a QSIG device or network.   Even if a customer has an internal VoIP network connected to a VoIP service provider, they may desire some calls to go to the local PSTN because of quality or network congestion issues ("best quality routing") or for cost reasons ("lease cost routing" and "toll bypass").  Also, customers may desire that all emergency "911" type calls go via a local PSTN rather than their VoIP service provider.

  • Medium and Large Enterprise Gateways
  • Telco/VoIP Gateways
  • Hybrid PBXs
  • B2BUAs
  • ISPs
  • VoIP service providers