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Answer Message
200 OK ACK
CONVERSATION
Release
Release
BYE 200 OK
Release Complete Release Complete Figure 4.3 Call flow between SS7 and SIP domains
There are a few cause codes that are different for ANSI SS7, as shown in Table 4.2. These cause codes are specific to networks in the U.S and wherever else ANSI SS7 is supported.
TABLE 4.2 ANSI SS7 Cause Codes Mapped to SIP Status Codes SIP Status Code 404 Not found 500 Server internal error 404 Not found 500 Server internal error 500 Server internal error 500 Server internal error 500 Server internal error
SS7 Cause Code 23 Unallocated number 25 Exchange routing error 26 Misrouted call to a ported number 45 Preemption 46 Precedence 51 Call type incompatible with service request 54 Call blocked due to group restrictions
Registration Procedures in a SIP Network
Of course there is not always a one-for-one mapping between two disparate protocols. Table 4.3 provides SIP status codes mapped to ITU SS7 cause codes.
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)
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
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TABLE 4.3
SIP Status Codes Mapped to SS7 Cause Codes (continued) SS7 Cause Code 127 Interworking 127 Interworking 127 Interworking 17 User busy 21 Call rejected 1 Unallocated number 127 Interworking
SIP Status Code 505 Version not supported 513 Message too large 580 Precondition failure 600 Busy everywhere 603 Decline 604 Does not exist anywhere 606 Not acceptable
The status codes, remember, indicate unsuccessful attempts to establish a session, much as the SS7 cause codes indicate failures to establish connections in the PSTN. There is actually a bit more information provided within the SIP status codes, but this is primarily because they cover so many different variables, while SS7 is only concerned with the connection of voice and data circuits. The actual messages used to establish connections must also be mapped. When a call is originated in the SS7 domain (or in the SIP domain, as we saw in the example in Figure 4.3), the signaling must be mapped so that the MGCF and the SIP proxies understand what must be managed within their own domains. When a MGCF receives an SS7 IAM it will extrapolate specific parameters from the IAM and use the values within these parameters for the SIP INVITE that it must generate and forward to the SIP domain. The following SS7 parameters are captured by the MGCF for this purpose:
Called party number Calling party number Calling party s category Forward call indicators Hop counter Nature of connection indicators Transit network selection User service information
These parameters provide vital information needed to successfully establish a session within the SIP domain, and therefore the parameters (found in the SS7 IAM) are converted to their SIP equivalents and used in the SIP INVITE.
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