Enterprises and contact centers have a growing interest in using SIP and H.323 trunks for interconnecting IP-PBX islands and enabling native IP communications for voice, conferencing, messaging and collaboration. Moreover, as organizations migrate to all IP, they are looking to service providers to take VoIP traffic from their sites and provide IP to PSTN gateway services for inbound and outbound traffic. Savings can be realized by leveraging more efficient and economical IP connections. Direct VoIP peering between sites also simplifies the introduction of applications such as unified communications.
Benefits include:
Reduced costs by eliminating media gateways and TDM voice trunks, while collapsing applications on existing data networks.
Simplified operations.
Faster provisioning and deployment.
Flexible routing policies maximize efficiency, disaster recovery and business continuity.
Direct Inward Dialing (DID) capabilities under full T1 or PRI capacities.
Increased quality.
Features such as interactive video, network call recording, presence, instant messaging and multimedia collaboration.
Connecting IP-PBXs to provider networks using IP trunks introduces challenges and unique requirements for building a trusted border. Critical capabilities include:
Hiding and protecting network resources and user information.
Exchanging traffic across heterogeneous networks with differing or conflicting network characteristics.
Maintaining network availability and service quality during abnormal busy periods.
Routing calls in cost-effective manner and capturing session data for accounting and traffic management and planning.
Enabling emergency service routing and call recording to comply with government regulations.
To overcome these challenges session border controllers (SBCs) are deployed at both ends of the trunk. They enable seamless communications across borders between the enterprise sites and provider network and mediate the differences in the various networks as well as providing security, quality and cost control.
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