C.3 Generic DHCP test procedure for IPv6

34.229-13GPPInternet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Part 1: Protocol conformance specificationRelease 16TSUser Equipment (UE) conformance specification

The generic test procedure (according to RFC 3315[23]):

1 The UE may send a DHCP SOLICIT message requesting to resolve P-CSCF Domain Name(s).

2 The SS responds with a DHCPADVERTISE message containing the IP address of the SS as P-CSCF address, if the UE requested the SIP Servers option within the DHCPSOLICIT message.

3 The UE may send a DHCP INFORMATION-REQUEST message if it has sent a DHCP SOLICIT message before. The UE shall send a DHCP INFORMATION-REQUEST if it has not sent a DHCP SOLICIT message before.

4 The SS responds with a DHCPREPLY message containing the IP address of the SS as P-CSCF address.

Expected sequence

Step	Direction		Message	Comment
	UE	SS
1	🡪		DHCP SOLICIT	Optionally requesting to locate a DHCP server.
2	🡨		DHCPADVERTISE	Sent if the UE requested the SIP Servers option within the DHCPSOLICIT message.
3	🡪		DHCPINFORMATION-REQUEST	Optional message if DHCP SOLICIT was sent before, otherwise mandatory..
4	🡨		DHCPREPLY	Sent if DHCPINFORMATION-REQUEST is received.

NOTE: The default message contents in annex B are used.