RFC4083 - Input 3rd-Generation Partnership Project (3GPP) Release 5 Requirements on the Session Initiation Protocol (SIP)

   All mobile terminal originated session setup attempts must transit
   the outbound proxy so that the services provided by the outbound
   proxy can be delivered to the mobile terminal.

4.15.2.  SIP Serving Proxy in the Home Network

   The serving proxy in the home network allows triggering of user-
   customized services that are typically executed in an application
   server.

   All mobile terminal originated session setup attempts must transit
   the serving proxy in the home network so that the proxy can properly
   trigger the SIP services allocated to the user (e.g., speed dial
   substitution).  This implies a requirement for some sort of source-
   routing mechanism to ensure these proxies are transited correctly.

4.15.3.  INVITE Might Follow a Different Path than REGISTER

   The path taken by an INVITE request need not be restricted to the
   specific path taken by a mobile terminal originated REGISTER request;
   e.g., the INVITE may traverse just the SIP outbound proxy and the SIP
   serving proxy, without passing through any other proxies.  However,
   the path taken by the INVITE may follow the same path taken by the
   REGISTER.

4.15.4.  SIP Inbound Proxy

   The visited network may apply certain services and policies to
   incoming sessions (such as establishment of security services or
   interaction with the media reservation mechanism).  Therefore, the
   visited network may contain a SIP inbound proxy for terminating
   sessions.  In general, the SIP inbound proxy and the SIP outbound
   proxy are the same SIP proxy.

4.15.5.  Distribution of the Source Routing Set of Proxies

   Sections 4.15.2 and 4.15.4 assume that a source-routing mechanism is
   used to effect traversal of the required SIP proxies during session
   setup.

   There must be some means of dynamically informing the node that adds
   the source-routing set of proxies that the INVITE has to traverse
   (e.g., the outbound proxy or serving proxy) of what that set of
   proxies should be.

   The hiding requirements expressed in Section 4.12 also apply to the

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