Emergency Standalone Proxy

Service survivability for today’s SIP-centric voice infrastructures

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    Meet regulatory requirements for service survivability

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    Complete support for any modern access technology

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    Local calling, emergency (911) calling with caller-ID, and trunk calling

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    Highly scalable: up to 500,000 subscribers per instance

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    Flexible collocation and standalone deployment options

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    Integrated with MetaView network management system


Metaswitch’s Emergency Standalone (ESA) Proxy preserves voice calling capability and emergency service access in heterogeneous access networks connected to a SIP core.

Adding ESA functionality into an operator’s network architecture is easy.

The ESA function acts as a SIP proxy Registrar, monitoring registrations and building a dynamic database of endpoints, while passing the registrations into the core network Registrar as usual.

From mobile clients to BLCs, registered endpoints can include any device that presents an upstream SIP interface to the core network.

If the access network loses connectivity with the core network, the ESA Proxy uses its learned registration information to maintain service continuity and call capabilities within its service area.

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Why use Metaswitch’s Emergency Standalone Proxy?

Metaswitch’s ESA Proxy enables network operators to meet their regulatory requirements and preserve those most important services when people need them most.

The transition from fixed-line TDM telephony services to Voice over IP (VoIP) is progressively pushing VoIP’s signaling mechanism – the Session Initiation Protocol (SIP) – even further towards the network edge, encompassing not only trunking and interconnect but also the critical connections between the switching core and the access infrastructure responsible for delivering local subscriber services.

While this transition is in progress, network operators must continue to meet the regulatory requirement for Emergency Standalone to support critical lifeline and first responder services. Protecting SIP traffic from the impact of lost connectivity to the central core is a key part of ensuring continuity of voice services and in particular access to emergency calling.

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