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Overview

In times of emergency, communication networks may become congested. Government, law enforcement, and defense departments may find it difficult to coordinate tasks among teams in various locations. In the Public Switched Telephone Network (PSTN), the Government Emergency Telecommunications Service (GETS) number gives precedence to emergency calls to state, federal, and other non-governmental organization personnel. When a user dials a special GETS number, the call is completed on priority. This is because the first switch that detects the GETS number modifies the CPC field in the ISUP IAM message so that the call gets the priority for completion. From then on, every switch along the way provides priority status to this call.

The VoIP networks that use SIP signaling provides a similar mechanism. The Resource Priority Header (RPH) in the SIP signaling message provides the capability to signal High Probability of Completion (HPC) status in a SIP-based network. In the IP layer, the precedence to the packets are identified by the Differentiated Services Code Point (DSCP) value.

GETS provides emergency access and priority processing for both local and long distance telephone calls. Even when the communication network is congested GETS calls are prioritized over normal calls.

Purpose

This document provides information to set up the GETS functionality in the SBC, GSX, PSX products.

It also provides information about the following:

  • GETS call identification
  • HPC call Handling
  • Call queuing
  • Configuration
  • GUI changes
  • Statistics supported on the EMS
  • Other relevant details

Intended Audience

This guide is intended for customers who have a good understanding of Ribbon SBC, PSX, and the EMS devices. Customer knowledge and experience is crucial to using the guide. The provisioning information included in these application notes should only be implemented after the customer applies the appropriate SBC and PBX configurations on their servers. You can find installation and configuration instructions in the Ribbon Product Documentation.

Do not use this guide to set up or provision any end-to-end solutions. The guide includes only information recorded while setting up specific scenarios. Ribbon product documentation is often referenced when configuring Ribbon products using the guide since the intent is to use existing documentation whenever possible.

Applicable Products

The following Ribbon products include the GETS functionality:

Table : Applicable products

ProductRelease
SBC8.1
PSX12.1
GSX11.1.1
EMS12.1

Platforms Supporting GETS

GETS functionality is available on the following Platforms.

Table : Supported Platforms

ProductVariants
SBC
Hardware
  • SBC 5000 series
  • SBC 5400
  • SBC 7000
SBC SWe
  • Virtualized: KVM and OpenStack
  • Cloud: OpenStack and AWS
PSX
HardwareHP ProLiant DL360p G8 server
PSX SWe
  • Virtualized : KVM and OpenStack
  • Cloud:  OpenStack and AWS
GSXGSX 9000
EMSAll

Abbreviations and Acronyms

Table : Abbreviations and Acronyms

TermDescription
COSEthernet Class of Service

DSCP

DiffServ Code Point

EMSRibbon Element Management System

ETS

Emergency Telecommunications Service

GETS

Government Emergency Telecommunications Service

HPC

High Probability of Completion

Note: Priority calls in the PSX are sometimes referred to as HPC calls

IMS

IP Multimedia System

NGN

Next Generation Networks

PSXRibbon Policy and Routing Service
PSTNPublic Switched Telephone Network
RPHResource Priority Header
SBCRibbon Session Border Controller
SIPSession Initiation Protocol (as defined in RFC 3261)

WPS

Wireless Priority Service