Gateway Mobile Switching Center (GMSC)
 

Gateway Mobile Switching Center (GMSC)

Modulo’s GMSC is used by MVNOs to route calls to/from outside their mobile network. Built around the Telcobridges TMG Series Class 4 Switch, our software transforms it into a GMSC, which allows MVNOs to perform seamless call routing using protocols such as ISUP, ISDN, CAS and all types of SIP.

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Description

What is a GMSC?

The Gateway Mobile Switching Center (GMSC) is a mobile network element used by MVNOs (Mobile Virtual Network Operators) to route calls to/from outside their mobile network.

Many of today’s “light” MVNOs are highly dependent upon a backing MNO for services such as call routing. Because of this dependency, MVNOs can’t choose the most profitable routes for their network, and they incur high fixed costs for routing calls outside their network.

Due to the high costs of inter-network call routing, Mobile Telephony ROI highly depends on the routes that Voice calls take from the operator’s network to other mobile networks. The choosing of custom, cheap or high-quality routes to complete calls is a key element in determining a Mobile Operator’s profitability.

For MVNOs looking to expand from a light MVNO to a full MVNO setup, the upgrade entails deploying a Gateway MSC. Whenever a call for a mobile subscriber comes from outside the mobile network, or whenever the subscriber wants to make a call to somebody outside the mobile network – the call will be routed through the GMSC.

When an MVNO has its own GMSC, it can set up route agreements with peer network operators that are more profitable than the ones used by its backing MNO. Lowering routing costs this way can significantly increase the MVNO’s ROI and overall profitability.

About the Modulo GMSC

Modulo’s GMSC is built around the Telcobridges TMG series Class 4 Switch, leveraging its features to seamlessly route calls to/from protocols such as ISUP, ISDN, CAS and all types of SIP. By using Telcobridges’ TMG series, our GMSC allows operators to connect to any type of technology that has been available for the last 30 years for carrying voice calls.

Modulo’s GMSC also allows offline and real-time charging: It allows creating a call data record for each call that can be processed by a billing server, or connecting to a 3rd party billing server via a real-time protocol (such as RADIUS or DIAMETER) in order to make decisions on call routing and accounting.

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    Architecture of the Modulo GMSC

    The Modulo GMSC Architecture

    Modulo’s GMSC Feature Highlights

    • Web-based GUI providing a complete and comprehensive O&AM interface
    • Carrier-grade redundancy achievable through 1+1 configuration
    • Carrier-grade scalability achievable through N+1 configuration
    • Extensive VoIP Signaling Support: SIP/SIP-I/SIP-T
    • Extensive SS7 Signaling Support: MTP/SIGTRAN, ISUP, PRI, CAS, MAP & CAMEL
    • CDR generation for off-line billing
    • Lawful Interception Interface
    • Can scale up to 32,768 circuits in a single-managed node
    • Complete Class4 routing capabilities
    • Support copper and optical physical interfaces and mix between them
    • SNMP Traps for Alarms monitoring
    • Call routing based on trunk group, calling/called numbers digit manipulation, call cause code mapping
    • Advanced call routing: Priority, load sharing, route retry, Nature of Address (NOA) manipulation
    • Programmable call routing: Access and manipulation of call parameters
    • RADIUS AAA (supports multiple RADIUS servers)
    • NPA-NXX routing (over 100,000 table entries)

    Modulo GMSC Functional Specifications

    Host TelcoBridges TMG Series
    PSTN Interfaces E1/T1

    DS3

    STM-1
    IP Interfaces Dual 100/1000Base-T with optional bonding
    Management Interfaces Single 100/1000Base-T for OAMP+T

    1 RJ45 serial port with RS-232C adapter

    Supports virtual IP
    Vocoders Universal codecs: G.711, G.723.1, G.726, G.729ab, T.38 V.17, clear mode (RFC 4040)Other codecs: G.722.2 (AMR-WB), G.728, G.729eg, iLBC, AMR, EVRC, GSM FR/EFR, T.38 V.34, QCELP
    Fax/Modem/Data T.38 fax relay (V.17 and V.34)

    Automatic G.711 fallback, modem and data pass-through

    Clear mode (RFC 4040)
    DTMF Relay RFC 2833

    SIP INFO Method

    In-band
    Echo Cancellation G.168 echo cancellation

    128 ms echo tail on all channels simultaneously
    Voice Enhancements Adaptative and programmable jitter buffer (20 to 200 ms)

    Voice activity detection (VAD)

    Comfort noise generation (CNG)
    SIP Signalling Supported RFCs: 2327, 2833, 2976, 3204, 3261, 3262, 3263, 3264, 3311, 3323, 3325, 3326, 3372, 3389, 3398, 3515, 3551, 3555, 3578, 3581, 3665, 3666, 3764, 3891, 4028, 4694, 5806

    SIP-I/SIP-T
    SIGTRAN M2PA, M2UA, M3UA (IPSP, ASP, SG), IUA

    SCTP (raw IP and UDP)

    SS7 termination and/or relay supported

    Up to 64 M2UA/M2PA links

    Up to 20 M3UA peer server processes
    SS7 Up to 64 MTP2 links (56, 64, n x 56/64 kbps, HSL)

    Multiple redundant MTP2 links

    Up to 64 MTP3 originating point codes and linksets

    ISUP variants: ITU 92, ITU 97, ANSI 88, ANSI 92, ANSI 95, Q.767, Telcordia 97, ETSIv2, ETSIv3, China, Singapore, UK, Brazil, SPIROU, Japan NTT

    SCCP routing and global title translation
    ISDN PRI Q.931 ISDN PRI: NI-2, 4ESS, 5ESS, DMS-100, DMS-250, Euro ISDN, ETSI NET5 (France, Germany, UK, China, Hong Kong, Korea), NTT (Japan), Australia

    Download the GMSC Product Sheet

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