TsB2BUA Back-to-Back User Agent Server Overview

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1 Ts2 ack-to-ack User gent Server Overview Source Code SDK Ts2 from TeleSoft International is a highly ptable, highly scalable software ack-to-ack User gent ackto-acksession Initiation Protocol server ( server). Ts2 is delivered as a set of configurable source code files designed to run as an application on a wide range of operating systems and embedded host-based platfms and servers. Ts2 is built to interoperate with a wide range of service providers, other servers (e.g., sterisk) and end-user phones from a variety of manufacturers/developers. ecause it is delivered in source code fm, customers can customize and differentiate their 2-based products quickly and cost-effectively using Ts2 software building blocks. Ts2 is a member of the TsSipServer family of server building blocks that can be assembled in different combinations f different customer applications. nother member of the TsSipServer family is TsProxy, a Proxy Server with without Registrar(s). TsProxy can provide the functions of a -PX f a local netwk. ack-to-ack-user-gent (2) is a server that lets users in one domain (e.g., connect Voice-over-Internet Protocol (VoIP) calls to users in another domain (e.g., company/ganization uses 2(s) to connect its internal netwk(s) to the netwks ( domains) of its: remote company locations service providers customers suppliers partners Versatile Ts2 is designed to be configured at both compile and run-time to fit a wide range of 2 topologies and applications. t its heart, Ts2 has a Call Router-Nmalizer software entity which routes and maps (refmats) messages between different users in separate domains (logical sub-netwks). Each domain is often associated with a Registrar, it may be a trunk domain that has no registrar/ process involved. domain is typically a collection of User gent () endpoints (e.g., VoIP phones) and a server that mediates calls between users in the domain. s each message passes Ts2 between different domain interfaces of the 2, Ts2 makes changes to the message to transfm the message so that it is valid in the destination domain. This message mapping/modification process is referred to as header nmalization. Ts2 automatically perfms default header nmalization that wks f many customers without modification, but Ts2 source code comments and documentation make it easy f the TeleSoft customer to customize message nmalization to fit their unique mapping needs, if any. Ts2 can be configured to contain an integrated Registrar/Proxy server, providing proxy call services to users who register with the Ts2 Registrar. user s phone which registers with the Ts2 Registrar can be in the local office remotely located while accessing Ts2 over the Internet. users can make local calls to other local users registered on that Ts2 Registrar, to remote users on other domains/netwks across the Internet. Ts2 can also be configured with no enabled to interwk/call between two me trunks/domains where no is involved. nother special Ts2 configuration suppts Fum Connect 1.1 Registration Mode that allows many phones registered on the internal Registrar/Proxy side of Ts2 to register with an external service provider via a single transaction on the service provider interface. 1

2 TeleSoft International Ts2 Server Overview Figure 1 shows the general Ts2 system configuration. Ts2 -PX CP idirectional IW Call Leg 2 Wking (IW) Optional Registrar of local s Optional (s) with (s) idirectional IW Call Leg CP -PX Or (s) Header Nmalization Figure 1 General Ts2 Configuration lthough Figure 1 shows two internal s (gents) within the overall Ts2 box, Ts2 can actually suppt N-number of internal s/gents (subject to memy and processing power constraints) per Ts2 build, with each internal /gent configured as a Registrar, a Registering Entity, a trunk with no involved. Highly Ptable Ts2 is provided in NSI C source code fm and is therefe highly ptable to most platfms, from lowpower embedded to highly scalable multi-threading servers. The high ptability and scalability of Ts2 are a result of its minimal OS dependencies: 1) UDP/TCP/IP sockets 2) small set of common standard C run-time library system calls (e.g., strcpy) 3) optionally, POSIX sockets if multithreading is needed f the particular customer configuration. lthough Ts2 is usually shipped with Linux as the OS, the Ts2 OS bstraction (OS) package is available f a number of other OSs/RTOSs (e.g., VxWks). vailable Internet-based training from seni TeleSoft software engineers can help speed understanding and timeto-market. 2

3 TeleSoft International Ts2 Server Overview Suppted 2 Functions Ts2 can provide several imptant netwk functions as a gateway between two me companies/departments/ganizations private netwks. Some of the main Ts2 functions are: Call and Filtering Ts2 acts as an intermediary f users in one domain to place VoIP calls to users in another domain via a service provider domain, allowing selective filtering and custom value-add modification of messages as they pass the 2. Each end-toend user VoIP call has two 2 call legs, one from each endpoint to the 2. Registrar TS2 provides PX-like ability to register tens to thousands of users so that a central location, the Registrar, knows where (i.e., IP address) each registered user can be located at any given moment so that users can call each other within the local Ts2 Registrar domain, and also send and receive calls with usr endpoints outside the local Ts2 Registrar domain. Security Isolates different domains/netwks to the extent required f an application. Can hide details of the netwk on the other end of a VoIP call, providing security f each respective netwk domain. Secure protocols like TLS f and SRTP f RTP voice/video data can be used on one both call legs of a 2 call. Registering Entity allows users who register with the Ts2 internal Registrar to automatically register with an external service provider service account, allowing the locally registered Ts2 user to send and receive calls with the outside wld via the 2 connection to the external service provider other company/ganization domain (e.g., See Figure 2 f an example Ts2 configuration which has this feature. Ts2 has the optional ability to relay Real-Time Protocol (RTP) voice/video packets between two Ts2 domains. This can be useful f security f example, non-encrypted RTP can be used on the internal company side of Ts2 while encrypted SRTP is used to carry voice/video packets on the external side of Ts2 connected to a service provider. User gent () proven TeleSoft Compact stack handles most of protocol details. Ts2 is delivered as a flexible set of server C source code building blocks that TeleSoft customers can use to rapidly and cost-effectively develop a range of custom 2 products. The building blocks include: TsSipServer Call Router-Nmalizer TsSipServer gent TsSipServer Registrar TsSipServer Registering Entity TsSipServer User gent () Compact Stack In general, Ts2 will pass- transparently to the other side call leg any message headers and/ header parameters that are not recognized by the Ts2 Call Router-Nmalizer that is handling the header header parameter. s with all other TeleSoft protocol stacks, Ts2 Server is a standards-based solution; Ts2 has been developed to comply with the latest IETF Recommendations and Fum connect Technical Recommendations. The Ts2 Server SDK is written in NSI C language f ease of ptation, low overhead operation and small memy footprint. 3

4 TeleSoft International Ts2 Server Overview Ts2 Special Features Ts2 has several special features not typically available on servers: 1) Pass-Through Registration Mode (optional can be per Ts2 Registrar account) Illustrated in Figure 2 -- allows a local domain Ts2 Registrar account user to place VoIP calls to users outside the local domain via the Internet using an external service provider account (e.g. Vonage). In this mode, there is a separate external service provider account f each local Registrar account that needs to call outside the local Ts2 Registrar/Proxy server domain. Thus, when a local user registers with the Ts2 Registrar, it can automatically trigger on a cresponding account with an external service provider (e.g., Vonage). /... / F Internet (e.g., att.net) Internet F (e.g., vonage.net) CP (passes CP (passes s Ts2 2 Wking Registrar of s and any associated (s) with s Registration Mapping Header Nmalization Figure 2 -- Ts2 Configuration Individual Registration Pass Mode (passes... s CP Ts2 Registrar/ Proxy Server X (usually local LN) 4

5 TeleSoft International Ts2 Server Overview 2) The Fum s Connect 1.1 Registration Mode is suppted by Ts2 and illustrated in Figure 3. Connect 1.1 Registration Mode allows many phones registered on the internal Registrar/Proxy side of Ts2 to register with an external service provider via a single transaction on the service provider interface. SP-SSE of Trunk with RFC 6140 Registration (e.g., att.net) CP (as registering -PX) Ts2 2 Wking Registrar of s and RFC 6140 Registration with (s) Header Nmalization CP (passes (usually local LN) Figure 3 -- Ts2 Configuration connect 1.1 Registration Mode 3) Trunk to Trunk Configuration -- Figure 4 illustrates the other end of the range of Ts2 configurations (compared with Figures 2 and 3), with Figure 4 showing a 2 connected to two trunks in separate domains, with no on either side of Ts2: Ts2 -PX Trunk CP 2 Wking (Optional to register to Trunk(s)) Header Nmalization CP Trunk -PX Figure 4 -- Ts2 Configuration trunk on each side 5

6 TeleSoft International Ts2 Server Overview Ts2 Special Features continued 4) Per-user account option f added security to permit with Ts2 Registrar from only one particular IP address/location f that Ts2 Registrar account. 5) Multiple bindings per Ts2 Registrar account. llows me than one local phone to ring f an incoming call to a registered user, and first phone answered gets connected to the call. enefits of TeleSoft Software SDKs Simplifies 2 Server Design Speeds Time-to-Market Powerful features save valuable engineering resources and simplify product development. Includes Full Function Software The Ts2 Server is based on and incpates the proven TeleSoft Compact protocol software stack. Written in NSI C and using a small set of operating system calls, this Proxy Server requires minimal resources from any platfm. Compact suppts and is compliant with over 55 IETF RFCs. Ts2 Server Features Ts2 Server is a modular, high perfmance, easy-to-use SDK: Ideal f host & embedded applications Micro system memy size 200K-350K Modular architecture Hardware independent pplications OS independent connect Confmant IETF Confmant Written in NSI C f ease of ptation Ts2 runs as an application and can be run on a wide range of operating systems including Linux, Windows, MX, Nucleus, Micrium UC/OS II, OSE and VxWks. TeleSoft Compact is proven Extensively interop tested at multiple its and against sterisk, OpenS and 35 3rd party devices Routinely tture tested against IETF RFC 4475 and PROTOS test suites and in our own test labs Millions of clients in daily use wldwide TeleSoft dvantages TeleSoft software stacks are specifically architected f all types of embedded, mobile and host based applications and are optimized f high perfmance and very small code size. ll TeleSoft protocol software stacks are 100% hardware independent and run as applications that enable easy ptation to different software and hardware platfms. Purchasing TeleSoft Software TeleSoft software products are supplied under a commercial license in source code fm. Project costs are kept under control with cost-effective licensing fees. Documentation Comprehensive documentation includes Pting Guide and User Guide provided in a searchable soft fmat. bout TeleSoft International, Inc. TeleSoft International, Inc., is an industry-leading, US-based provider of field-proven, scalable, standards-based protocol stacks f developers. We specialize in telecom applications, licensing source code stacks to OEMs and ODMs wldwide f, VoIP, S-, ISDN,.931,.921, MLPP, SIG, Supplementary s, ML-PPP, PPP, Frame Relay, T1 RS, E1 CS R2, and X.25. Contact Us: T: F: [email protected] 2011 TeleSoft International. ll rights reserved. This document is TeleSoft public infmation. 6