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TABLE 4.3 SIP Status Codes Mapped to SS7 Cause Codes SS7 Cause Code 127 Interworking 127 Interworking 127 Interworking 127 Interworking 1 Unallocated number 127 Interworking 127 Interworking 127 Interworking 127 Interworking 22 Number changed 127 Interworking 127 Interworking 127 Interworking 127 Interworking 127 Interworking 127 Interworking 127 Interworking 20 Subscriber absent 127 Interworking 127 Interworking 127 Interworking 28 Invalid number format 127 Interworking 17 User busy 127 Interworking 127 Interworking No SS7 equivalent 127 Interworking 127 Interworking 127 Interworking 127 Interworking 127 Interworking 127 Interworking (Continued)

In 3 we discussed the methods that allow sharing data only. In 4 we discussed remote procedure call (RPC), which for the first time allowed two applications to share functionality (in addition to sharing data). RPC is powerful enough to be the basis of client/ server architecture, which is commonly used for Internet and network applications. However, RPC has a number of shortcomings that prevent it from being a complete and satisfactory solution for integrating all applications in a large enterprise. In this chapter, we will begin to address some of these shortcomings, including the following:

SIP Status Code 400 Bad request 401 Unauthorized 402 Payment required 403 Forbidden 404 Not found 405 Method not allowed 406 Not acceptable 407 Proxy authentication required 408 Request timeout 410 Gone 413 Request entity too long 414 Request-URI too long 415 Unsupported media type 416 Unsupported URI scheme 420 Bad extension 421 Extension required 423 Interval too brief 480 Temporarily unavailable 481 Call/transaction does not exist 482 Loop detected 483 Too many hops 484 Address incomplete 485 Ambiguous 486 Busy here 487 Request terminated 488 Not acceptable here 491 Request pending 493 Undecipherable 500 Server internal error 501 Not implemented 502 Bad gateway 503 Services unavailable 504 Server timeout

Marketing experts call this practice branding: using graphics and slogans to build an identity and distinguish yourself from others in the marketplace. There are lots of sellers on eBay, and chances are someone else is already selling merchandise similar to yours. A logo might cost $200 to $500 to design, but you can use it for many years and make it part of your business cards and your stationery as well as your eBay sales descriptions. (Marjie got her logos from a graphic designer who is a friend of the Disabled Users Online Association.) You can find a professional graphic designer who will be only too happy to design a logo for you and your business on eLance Online (http://www.elanceonline.com).

There is little room for code reuse because the code for marshalling and unmarshalling and the code for network communication are buried inside the client and server applications. RPC is not language independent. In other words, the server and client applications must be written in the same programming language. Servers and clients written in two different programming languages cannot share functionality. RPC integrates the client and server applications in a point-to-point manner, which is not appropriate if a large number of applications need to be integrated. The number of integrations you need to perform in a point-to-point approach increases rapidly (roughly N2, where N is the number of applications in an enterprise that are being integrated). On a related note, in RPC the roles of client and server are xed, and the relationship between the client and the server is not peer to peer. In other words, the client can access the functionality embedded in the server, but not the other way around.

4

In addition to addressing these issues, in this chapter we will look at the need for a directory and naming service This need for a directory eventually led to the SOA Registry and Repository, which is one of the very important components of SOA In order to address these issues, we seek a solution that allows code reuse by separating out the code for marshalling and network communication into a standalone component (application) This separation also allows us to move away from the point-to-point approach because many applications can connect to each other using this new component Furthermore, we will see a peer-to-peer relationship between the applications rather than a client/server relationship Two other important features of the solution we seek are language independence and platform independence Language independence is desired because we would like applications written in different programming languages to be able to communicate and share functionality.