SIP-QSIG Software for Signaling Interworking

TeleSoft International provides SIP-PSTN signaling interlocking, which includes TeleSoft's Embedded SIP source code software, and QSIG protocol stack. in order to accelerate development and interoperability testing of your gateway or similar product. TeleSoft's QSIG protocol stack and SIP software libraries provides the fastest path to market-ready QSIG to SIP gateway products for manufacturers worldwide.

TsGATE is an integrated software SIP to QSIG Gateway software design kit that translates the packetized signaling messages on IP networks to the  messages used on the digital QSIG networks. TsGATE takes advantage of existing proven TeleSoft stacks by combining the CompactSIP SIP stack with the TsLink3 QSIG signaling stacks and integrating these with the TeleSoft SIP-QSIG Interworking Module. TsGATE is an ideal solution for OEMs developing embedded gateways and adapters since the TsGATE Soft Gateway is hardware and RTOS independent and can be ported to a wide variety of platforms to create IP to TDM conversion products. TsGATE is also available integrated with the interpeak IPNET advanced networking stack that includes IPv4 and IPv6 to form a complete protocol signaling converter.

The TeleSoft SIP-QSIG Gateway is a special case of the more general SIP-PSTN gateway;  it is possible to combine the QSIG-SIP gateway and the PSTN-SIP gateway in the same code load.  This would also result in a QSIG-PSTN gateway.

SIP-QSIG Signaling Interworking Features

  • CompactSIP 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
  • Based on field-proven software stacks
  • Written in ANSI C source code for ease of portation
  • Developed for embedded applications

SIP to QSIG Gateway Source Code

SIP - QSIG Gateway Signaling Interworking Digaram

SIP-QSIG Signaling Interworking applications

TsGATE Soft Gateway is ideal for for cost and memory sensitive applications, from a desktop terminal adapter to the largest system. 

  • 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 of the Compact SIP 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 Compact SIP 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

TeleSoft International is a premier supplier of circuit switched telephony and VoIP Protocol signaling stacks & solutions to leading OEMs worldwide. TeleSoft has been selected by more than 250 OEM customers and we continue to provide robust, mature, conformance and interoperability tested solutions to customers who require the best performing software stack solutions.

The TeleSoft protocol software development toolkits (SDKs) offer highly optimized protocol stack solutions that combines very small memory footprints with high performance and no compromises on functionality and scalability. All TeleSoft SDKs are supplied in source code written in ‘C’ for ease of portation.

Telecom and VoIP have needs that are different than data communications, and the industry is just realizing how different VoIP is from datacom.   Telecom protocols are required to be robust, and if VoIP is to be widely accepted, it must be as robust as the existing PSTN.  Doesn't it make sense to license your Voice over IP (VoIP) signaling protocol from the voice experts?