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Dispatching & Surveillance System

How Sbc Works in IP Dispatching System and Surveillance System

• Overview

With the rapid development of IP and information technology, the fire fighting and emergency rescue system is constantly improving and upgrading. IP dispatching system integrated with voice, video and data has become an indispensable part of emergency, command and dispatching system, to realize the unified command and coordination between different sites and departments, and to achieve real-time monitoring, rapid and efficient response to security incidents.

However, the deployment of IP dispatch system is also facing new challenges.

How to ensure the security of the core system and prevent network attacks when the business server and media server communicate with external devices through the Internet?

How to ensure the normal interaction of business data flow in cross network NAT environment when the server is deployed behind firewall?

Video monitoring, video stream retrieval and other services usually involve some special SIP headers and special signaling processes. How to ensure stable communication of signaling and media between both parties?

How to provide stable and reliable communication, ensure QoS of audio and video stream, signaling control and security?

Deploying Cashly Session Border Controller at the edge of dispatching and media server can effectively solve the above challenges.

Topology of Scenario



DOS / DDoS attack defense, IP attack defense, SIP attack defense and other security firewall policies to protect the system.

NAT traversal to ensure smooth network communication.

QoS services, quality monitoring/reporting to improve the audio and video quality.

RTMP media streaming, ice port mapping and HTTP proxy.

Support in-dialog and out-of-dialog SIP MESSAGE method, easy to subscribe video stream.

SIP header and number manipulation to meet various requirements of different scenarios.

High Availability: 1+1 hardware redundancy to ensure operation continuity.

Case 1: Sbc in Forest Video Surveillance System

A forest fire station, who is responsible for forest fire and other natural disaster rescue, wants to build an IP dispatching communication system, that mainly use Unmanned Aerial Vehicle (UAV) to monitor around and broadcast calls, and transmit real-time video through wireless network to the data center. The system aims to greatly shorten the response time and facilitate rapid remote dispatching and command. In this system, Cashly Sbc is deployed in the data center as the border gateway of media stream server and core dispatching system, which is providing signaling firewall, NAT traversal and video streaming subscription service to the system.

Network Topology


Key Features

Management: staff management, group management, monitor environments and collaboration among distributed teams and departments

Video monitoring: real-time video playback, video recording and storage etc.

IP audio dispatching: single call, paging group etc.

Emergency communication: notification, instruction, text communication etc.


Sbc works as outbound SIP proxy. Dispatching app and mobile app endpoints can register with unified communication server through Sbc.

RTMP streaming media proxy, Sbc forwards the video stream of UAV to media server.

ICE port mapping and HTTP proxy.

Realize the customer FEC video stream subscription service by Sbc header passthrough.

Voice communication, SIP intercom between dispatching console and mobile app.

SMS notification, Sbc supports SMS notification via SIP MESSAGE method.

All signaling and media stream need to be forwarded to data center by Sbc, which can solve the problems of protocol compatibility, NAT traversal and security.

Case 2: Sbc helps petrochemical enterprises successfully deploy video surveillance system

The production environment of chemical enterprises is generally under high temperature, high pressure, high speed, and other extreme conditions. The materials involved are flammable, explosive, highly toxic, and corrosive. Therefore, safety in production is the premise of normal running of chemical enterprises. With the development of science and technology, video surveillance system has become an indispensable part of the safety production of chemical enterprises. Video surveillance is installed in the dangerous regions, and the remote center can monitor the situation remotely and in real time, to find out the potential dangers of accidents on-site and do better emergency treatment.



Key Features

Cameras are installed at each key point in the petrochemical park, and the remote monitoring platform can view the video randomly.

The video server communicates with SIP server through SIP protocol and establishes the network connection between camera and monitor center.

The monitoring platform pulls the video stream of each camera through SIP MESSAGE method.

Realtime monitoring at remote center.

Video recordings are stored centrally to ensure that the dispatching and command process is properly recorded.


Solve NAT traversal issue and ensure the smooth communication between cameras and remote monitoring center.

Check camera video by SIP MESSAGE subscriptionr.

Control the angle of the cameras in real-time via SIP signaling passthrough.

SDP header passthrough and manipulation to meet various business needs.

Solve the compatibility issues by sbc SIP header manipulation by standardize SIP messages sent by video servers.

Forward pure video service through SIP message (peer SDP message include video only, no audio).

Select real-time video streams of the corresponding camera by sbc number manipulation feature.