3gpp 3gpp ts 33203 v12670 2014 0609 63 release 12

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3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 63 Release 12
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NOTE: The protected server port port_ps stays fixed for a UE until all IMPUs from this UE are de-registered. It may be fixed for a particular P-CSCF over all UEs, but there is no need to fix the same protected server port for different P-CSCFs. NOTE: The distinction between the UDP and the TCP case reflects the different behaviour of SIP over UDP and TCP, as specified in section 18 of RFC 3261 [6]. NOTE: The handling of the protected ports is the same, irrespective of whether transport or UDP encapsulated tunnel mode is used. 2. The UE associates two ports, called port_us and port_uc , with each pair of security associations established in an authenticated registration. The ports port_us and port_uc are different from the standard SIP ports 5060 and 5061. No unprotected messages shall be sent from or received on the ports port_us and port_uc . From a security point of view, unprotected messages may be received on any port which is different from the ports port_us and port_uc . The number of the ports port_us and port_uc are communicated to the P-CSCF during the security mode set-up procedure, cf. clause 7.2. These ports are used with both, UDP and TCP. The use of these ports may differ for TCP and UDP, as follows: UDP case: the UE receives requests and responses protected with ESP on the port port_us (the"protected server port"). The UE sends requests and responses protected with ESP on the port port_uc (the "protected client port"). TCP case: the UE, if it does not have a TCP connection towards the P-CSCF yet, shall set up a TCP connection to the port port_ps of the P-CSCF before sending a request to it. NOTE: Both the UE and the P-CSCF may set up a TCP connection from their client port to the other end's server port on demand. An already existing TCP connection may be reused by both the P-CSCF or the UE, but it is not mandatory. NOTE: The protected server port port_us stays fixed for a UE until all IMPUs from this UE are de-registered. NOTE: The distinction between the UDP and the TCP case reflects the different behaviour of SIP over UDP and TCP, as specified in section 18 of RFC 3261 [6] NOTE: The handling of the protected ports is the same, irrespective of whether transport or UDP encapsulated tunnel mode is used. 3. The P-CSCF is allowed to receive only REGISTER messages, messages relating to emergency services in accordance with TS 23.167 [31] and TS 24.229 [8], and error messages related to unprotected messages on unprotected ports. All other messages not arriving on a protected port shall be either discarded or rejected by the P-CSCF. 4. The UE is allowed to receive only the following messages on an unprotected port: - responses to unprotected REGISTER messages; - messages relating to emergency services in accordance with TS 23.167 [31] and TS 24.229 [8]; - error messages related to unprotected messages.
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