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SS7 & SIP Protocols

Synway offers Signaling System 7 (SS7) software as part of its broad range of protocols, allowing users to directly connect switching, media processing and signaling platforms to a carrier’s network–via TDM-based signaling transport. The SS7 protocols are suitable for worldwide deployment using Synway’s SHD series (with MAP protocols) and UMCT series Integrated Multimedia Switch Platform, bringing together DSP-based functions and PSTN connectivity on a cost-effective single platform for both IP and TDM environments.

SS7 is the protocol that defines the procedures to transport and process database queries necessary for providing today’s advanced intelligent network (AIN) features and services. SS7 is increasingly being used to bridge the PSTN with next-generation Internet Protocol (IP) and 3G Wireless networks, which enables seamless convergence and inter-working of PSTN and IP protocols within a unified architecture.

The SS7 packets combine to bring tremendous value for service providers and enterprise solution providers alike. A complete array of packets, including MTP1~3, ISUP, TCAP, SCCP, MAP and more, empower mobile solution providers to efficiently and rapidly deliver most value-added service and applications. The SS7 standard has been extended for multiple country-specific variations, such as ANSI in America and ETSI standard in Europe.

SS7 Stack Diagram

SS7 Network Architecture

Synway SS7 Solutions

Synway SS7 product line includes the following protocol layers:

Intelligent Network Application Protocol (INAP)

● Capability Set 1 (CS1), as defined by the ITU, ETSI, and the Generic Requirement (GR) standards of the Telcordia Advanced Intelligent Network (AIN)

● The interaction between the SSF, SCF, Specialized Resource Function (SRF), and the Service Data Function (SDF)

Mobile Application Part (MAP)

● Used by the Mobile Switching Center (MSC), Serving GPRS Support Node (SGSN), and Gateway GPRS Support Node (GGSN) in wireless networks to query the Home Location Register (HLR) or Visitor Location Register (VLR) to determine and/or verify subscriber services

ISDN User Part (ISUP)

● The signaling protocol to establish, maintain and release circuit-switched network connections across an SS7 network; can act as originating, destination or intermediate exchange

● ITU-T, Telcordia (formally Bellcore), ANSI, Singapore, Q.767, ETSI, FTZ, Russia, Italy, NTT (Japan), and other variants


● Defines the physical and functional characteristics of the digital signaling link


● Reliable transfer of signaling messages over signaling links

● ITU-T, ANSI, TTC (Japan), NTT (Japan), China, and other variants


● Broadband and narrowband signaling traffic management, signaling link and route management

● Functionality as an SSP or STP; Direct inter-working with Trillium Q.2140 ATM

● ITU-T, ANSI, TTC (Japan), NTT (Japan), Singapore, China, B-ICI, and other variants

Signaling Connection Control Part (SCCP)

● Connection-oriented and/or connection-less services (Class 0, 1, 2, and 3) for transferring data across an SS7 network

● ITU-T, ANSI, and China variants

Transaction Capabilities Application Part (TCAP)

● End-to-end, connectionless network service protocol between transaction capability users across an SS7 network

● An ASN.1 encoding/decoding engine to encode/decode all operation codes and dialog parameters

● ITU-T, ANSI, ETSI, and TTC (Japan) variants

Telephone User Part (TUP)

● Establishing, maintaining and releasing circuit-switched network connections across an SS7 network; can act as the originating, destination, or intermediate exchange

● ITU-T and China variants


The Global System or 3G for Mobile Communications (GSM) is a globally accepted standard for digital cellular communications. Mobile Application Part (MAP) – GSM/3G supports interactive mobile applications (e.g., cellular, paging, voice messaging) between the network entities in a GSM/3G system. These functional entities include Home Location Registers (HLRs)
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