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Softswitch solutions for CLASS 4 and CLASS 5 services from Flextronics Software Systems

FSS' Softswitch Framework

FSS' Softswitch conforms to TIPHON distributed gateway architecture. Softswitch solution from FSS supports a wide variety of signaling protocols, like SS7, R1/R2 and ISDN and has a potential to incorporate GR-303 and V5.2. FSS Softswitch can control media remotely through MEGACO and MGCP.

Softswitch Framework Context in System

Softswitch Configuration

The design of FSS' Softswitch enables easy deployment in the network. FSS Softswitch provides the flexibility to configure all external network elements like Gatekeeper, Media Gateway, Signaling Gateway, Application Server, etc. Policies can be configured by customizing Routing, Service Control and Address Translation. Further, product related configurations for initialization, provisioning and redundancy are available through open APIs.

Softswitch Service Architecture

• Services targeted – address translation, routing, IVR, Charging, Emergency, Network based, third party call handling, web based
• Service Interface provides support for – CLASS services/supplementary services, IN services, SIP based
• Architecture independent of signaling, but support for SIP, H.323, SS7, ISDN, R2, POTS ensured

FSS' Softswitch Framework : Functions

The FSS Softswitch is offered both as a product and a software framework with source license. FSS has already integrated the Softswitch into different product architectures and offers its services in integrating and porting the Softswitch solution onto the target.

Services

• Low-level call management APIs for INAP interfaces
• High-level call management APIs for Parlay adapter
• SIP interface to Application server
• CLASS services hosted natively
• Legacy and Enhanced services supported

Softswitch Framework Functional Block

Interworking Call Control

• IN CS2 – AIN 0.3 BCSM based call control
• Signaling Adaptations Supporting diverse SCN and packet protocols
• Enables easy integration of new signaling protocols

PSTN Interfaces

• SS7 termination (ANSI or ITU-T) either through external SG or direct
• Dual-seizure, reset, group blocking/unblocking supported
• Supports third-party pause and re-routing
• CAS R1/R2 supported on PSTN & H.323 v2 on packet network
• ISDN Q.931 interface supported

Packet Interfaces

• H.323 subscriber and trunk interface
• SIP subscriber and SIP-T trunk interface
• MGCP (RFC 2705) gateway interface
• MEGACO/H.248 gateway interface

Bearer Control

• H.248/MGCP based Gateway Control
• Ability to manage multiple transactions
• Enabling media control for packet-TDM inter-working
• Ability to manage various gateway types (Access, Trunking and Residential)

Resource Management

• Route Information maintained
• SCN and PDN terminations and associated data maintained
• Resource allocation, de-allocation and maintenance
• Local and External Address Translations supported
• Single point routing and distribution of messages to multiple MGs

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