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What is a SIP enterprise session border controller (eSBC)? Session Initiation Protocol (SIP) is the communication technology employed to set up and tear down VoIP phone calls (see What is VoIP?).

A session border controller (SBC) is a networking device positioned between networks to provide call setup and teardown (session), network demarcation/separation (border) and other types of management (control) over the data streams that pass through the device. Because the SIP specification allows for variations in implementation, a networking device known as a session border controller (SBC) is typically required at the demarcation point between carrier networks (peer-to-peer) or between the service provider network and the business subscriber LAN. In the latter case the device is called an enterprise session border controller (eSBC)-as distinct from a carrier-class SBC. Installed on the subscriber premises, the eSBC provides several essential networking functions for businesses that connect to an Internet Telephony Service Provider (ITSP) over a SIP trunk.

Order the Free Who needs a Session Border Controller


Show Me: SIP eSBCs

 
 

BRI Session Border Controller + Router

SmartNode 5530
Cost-effective SIP SBC provides 2 or 4 ISDN BRI S0 ports with secure TLS and SRTP encryption. The SmartNode™ 5530 Session Border Controller & Router bridges the wide range of IP-PBX products to their service providers ensuring security and a high level of efficiency in the VoIP network.

PRI Session Border Controller + Router

SmartNode 5570
The cost-effective SmartNode 5570 ESBC provides 1 or 2 T1/E1/PRI ports with state-of-the-art security features. Transcoding for up to 16 SIP-to-SIP calls, high-definition G.722 codec, and QoS deliver optimum voice quality over IP.

SIP-to-SIP Session Border Controller + Router

SmartNode 5480
Providing up to 64 transcoded calls, the SmartNode™ 5480 session border controller and router connects the wide range of IP PBX products to their service providers ensuring security and a high level of efficiency in the VoIP network.

Hybrid Session Border Controller + IAD

SmartNode 5490
Providing up to 64 transcoded calls, the SmartNode™ 5490 session border controller with built-in Fiber, EFM, G.SHDSL, ADSL or X.21 WAN router connects the wide range of IP PBX products to their service providers ensuring security and a high level of efficiency in the VoIP network.
 

Teach Me: What is a SIP eSBC?

 
An eSBC is required in All-IP and unified communications (UC) networking environments. In contrast to a VoIP gateway (see What is a VoIP Gateway?), which converts traditional TDM telephony to packet-based voice, a SIP eSBC is typically deployed in IP-to-IP implementations. Security issues-snooping, hacking, and especially toll fraud, are major concerns. To hide network topologies and protect service-provider and enterprise packet networks from malicious activity, an eSBC may terminate a received call and initiate a second call to the destination entity. This function is known as a back-to-back user agent (B2BUA). I high quality eSBC also provides transcoding for Wan optimizations and bandwidth management. Certain vendors have coined other names for their SBC products, including Multimedia Border Element (MMBE) or Unified Border Element. For more information about eSBCs and the challenges they can solve, get the white paper: Who needs a Session Border Controller?

Typical eSBC Applications
eSBCs can address various technical and practical challenges for organizations that wish to implement SIP trunking and/or unified communications (UC) solutions. Some common application scenarios are described below.

All-IP Communications with SIP Trunking
For SIP-to-SIP voice communications over a SIP trunk, interoperability is a common concern. Will the organizations IP PBX "play nice" with the SIP server in the ITSP network. The eSBC stationed on the customer premise can provide protocol translation (SIP normalization) to ensure everything works as planned.



Network Integration: Migration to All-IP with WAN Fallback/Failover
Many enterprises, from small to large, want to transition to All-IP IP communications, yet have concerns about reliability and/or existing PSTN service contracts. Using an eSBC that also provides legacy telephony ports, the existing PBX and PSTN connection can be preserved, while a new IP-PBX is introduced, tested, and proven. A a lifeline BRI interface, for example, can provide failover to a secondary provider or alternate WAN link for business continuity in the event of IP network failure.



eSBC Terminology
Short Glossary of Related Acronyms
B2BUA - Back-to-Back User Agent
CPE - Customer Premise Equipment
eSBC - Enterprise Session Border Controller
IP - Internet Protocol
ITSP - Internet Telephony Service Provider
SBC - Session Border Controller
SIP - Session Initiation Protocol
UC - Unified Communications
VoIP - Voice over IP
WAN - Wide Area Network

eSBC Synonyms
MMBR - Multimedia Border Element
CUBE - Cisco Unified Border Element



 

Help Me: SIP eSBC Technical Help

 
Patton offers an extensive online library of technical information to help you get your SmartNode eSBC up and running fast. Patton's web-based FAQs, configuration notes, and application notes provide the detailed knowledge you need to install, configure, troubleshoot and maintain your Patton eSBC. And these helpful resources are all free right here on www.patton.com. Patton stands behind our high-quality eSBC products-world-renowned for set-it-forget-it reliability and stability-with live email and phone support plus lifetime downloadable software updates absolutely free of charge.
 
 
 
All-IP eSBC IADs (Integrated WAN)
SmartNode, SN5300
eSBC + Router + IAD | Up to 60 SIP Sessions with optional G.SHDSL
SmartNode, SN5490
eSBC + Router + IAD | Up to 60 SIP Sessions with optional G.SHDSL, ADSL/VDSL, X.21, Fiber
All-IP Session Border Controllers
SmartNode, SN10500
Carrier-Grade Session Border Controller with TDM Fallback Capabilities | Up to 5000 signaling/media sessions
SmartNode, SN5200
eSBC + Router | 4-to-32 Sessions
SmartNode, SN5300
eSBC + Router + IAD | Up to 60 SIP Sessions with optional G.SHDSL
SmartNode, SN5480
eSBC + Router | Up to 64 Transcoded Calls
SmartNode, SN5490
eSBC + Router + IAD | Up to 60 SIP Sessions with optional G.SHDSL, ADSL/VDSL, X.21, Fiber
SmartNode, SN5500
eSBC + Router | 2 Ethernet ports for up to 200 SIP to SIP calls
SmartNode, SN5530
eSBC + Router | 2 to 8 BRI ports for up to 16 simultaneous phone or fax calls
SmartNode, SN5540
eSBC + Router | 2, 4 or 8 analog ports for up to 8 phone or fax calls
SmartNode, SN5550
eSBC + Router | 2FXS/2S0 or 4FXS/4S0 ports for up to 8 phone or fax calls
SmartNode, SN5570
eSBC + Router | 1 or 2 T1/E1/PRI interface for up to 30 simultaneous phone or fax calls
eSBCs with TDM Ports
SmartNode, SN4990A
PRI VoIP IAD | 1 or 4 T1/E1/PRI interface for up to 120 simultaneous phone or fax calls with Fiber, G.SHDSL, X.21, ADSL/VDSL
SmartNode, SN5530
eSBC + Router | 2 to 8 BRI ports for up to 16 simultaneous phone or fax calls
SmartNode, SN5540
eSBC + Router | 2, 4 or 8 analog ports for up to 8 phone or fax calls
SmartNode, SN5550
eSBC + Router | 2FXS/2S0 or 4FXS/4S0 ports for up to 8 phone or fax calls
SmartNode, SN5570
eSBC + Router | 1 or 2 T1/E1/PRI interface for up to 30 simultaneous phone or fax calls
 
 
 
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