< draft-song-pppext-sip-support-01.txt		draft-song-pppext-sip-support-02.txt >
	JUNHYUK SONG		JUNHYUK SONG
	INTERNET DRAFT SAMSUNG ELECTRONICS		INTERNET DRAFT SAMSUNG ELECTRONICS
	April 2003		April 2003
	SIP server IPCP configuration option for PPP		SIP server configuration option for PPP
	draft-song-pppext-sip-support-01.txt		draft-song-pppext-sip-support-02.txt
	Status of This Memo		Status of This Memo
	Distribution of this memo is unlimited.		Distribution of this memo is unlimited.
	This document is an Internet-Draft and is in full conformance with		This document is an Internet-Draft and is in full conformance with
	all provisions of Section 10 of RFC2026. Internet-Drafts are working		all provisions of Section 10 of RFC2026. Internet-Drafts are working
	documents of the Internet Engineering Task Force (IETF), its areas,		documents of the Internet Engineering Task Force (IETF), its areas,
	and its working groups. Note that other groups may also distribute		and its working groups. Note that other groups may also distribute
	working documents as Internet-Drafts.		working documents as Internet-Drafts.
	skipping to change at page 2, line 8 ¶		skipping to change at page 2, line 8 ¶
	This document defines a new configuration option for the PPP IPCP		This document defines a new configuration option for the PPP IPCP
	(PPP Internet Protocol Control Protocol), to return a list of the		(PPP Internet Protocol Control Protocol), to return a list of the
	IPv4 addresses of SIP proxy servers. This option provides one		IPv4 addresses of SIP proxy servers. This option provides one
	mechanism that a system may use to locate a SIP proxy server.		mechanism that a system may use to locate a SIP proxy server.
	This approach is applicable for a system that is using PPP for the		This approach is applicable for a system that is using PPP for the
	link layer protocol and IP address allocation.		link layer protocol and IP address allocation.
	1. Introduction		1. Introduction
	The SIP (Session Initiation Protocol)[3] is a signaling protocol		The SIP (Session Initiation Protocol)[3] is a signaling protocol
	used for the session invitation, modification and termination.		used for the session invitation, modification, and termination.
	The UAC(User Agent Client) sends a request to the UAS(User Agent		The UAC (User Agent Client) sends a request to the UAS (User Agent
	Server). However, the request message (INVITE) is not directly sent		Server). However, the request message (INVITE) is not directly sent
	to the callee UAS, it rather go through proxy servers, and possibly		to the callee UAS, it rather goes through proxy servers and possibly
	redirect servers. This draft is specifying one mechansim that a		redirect servers. This draft specifyies one mechansim that a
	system may use to locate a SIP procy server.		system may use to locate a SIP proxy server.
	This draft is specifying a IPCP option that allows SIP clients to		This draft specifies an IPCP (PPP Internet Protocol Control
	locate a list of SIP proxy servers that is to be used for all SIP		Protocol) option that allows SIP clients to locate a list of SIP
	requests. This approach is applicable to the system utilizing PPP		proxy servers that is to be used for all SIP requests. This approach
	for the link layer protocol and IP address allocation		is applicable to a system utilizing PPP for its link layer
	(ex. 3GPP2 Packet Data System)		protocol and IP address allocation (ex. 3GPP2 Packet Data System)
	Note : the format and behavior of these options are quoted from		Note: the text defining the format and behavior of these options is
	RFC1877 [2] for the sake of consistent implementation of PPP.		quoted from RFC1877 [2], to ensure a consistent implementation.
	2. Configuration Options		2. Configuration Options
	The Configuration Option format and basic options are defined by		The IPCP Configuration Option format and the basic options are
	IPCP configuration option [4].		defined in RFC 1332 [4]. This document defines the two new
			options: Primary SIP Server Address and Secondary SIP Server
	This document concerns the following values:		Address.
	[?] Primary SIP Server Address
	[?+1] Secondary SIP Server Address
	2.1. Primary SIP server Address Option		2.1. Primary SIP Server Address Option
	Description		Description
	This Configuration Option defines a method for negotiating with		This Configuration Option is used for negotiating with the remote
	the remote peer the address of the primary SIP server Address		peer the address of the primary SIP server Address to be used on
	to be used on the local end of the link.		the local end of the link.
	By default, no primary SIP server address is provided.
	A summary of the Primary SIP Address Configuration Option format is		A summary of the Primary SIP Address Configuration Option format is
	shown below. The fields are transmitted from left to right.		shown below. The fields are transmitted from left to right.
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length | Primary-SIP-Server Address		| Type | Length | Primary-SIP-Server Address
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Primary-SIP-Server Address(cont)|		Primary-SIP-Server Address(cont)|
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Type		Type
	? (Primary SIP Proxy server)		? [To be assigned by IANA] Primary SIP Server Address Option
	Length		Length
	6		6
	Primary-SIP-Address		Primary-SIP-Server-Address
	The four octet Primary-SIP-Server Address is the address of the		The four octet Primary-SIP-Server Address is the address of the
	primary proxy SIP server to be used by the local peer.		primary proxy SIP server to be used by the local peer. Setting
	If all four octets are set to zero, it indicates an explicit		these four octets to zero requests that the peer provide the
	request that the peer provide the address information in a		address information in a Config-Nak packet.
	Config-Nak packet.
	Default		Default
	No address is provided.		No primary server address is provided.
	1.3. Secondary SIP Server Address		1.3. Secondary SIP Server Address Option
	Description		Description
	This Configuration Option defines a method for negotiating with		This Configuration Option is used for negotiating with
	the remote peer the address of the secondary SIP server Address		the remote peer the address of the secondary SIP server Address
	to be used on the local end of the link.		to be used on the local end of the link.
	By default, no secondary SIP address is provided.
	A summary of the Secondary SIP Address Configuration Option format is		A summary of the Secondary SIP Address Configuration Option format is
	shown below. The fields are transmitted from left to right.		shown below. The fields are transmitted from left to right.
	0 1 2 3		0 1 2 3
	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1		0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Type | Length |Secondary-SIP-Server Address		| Type | Length |Secondary-SIP-Server Address
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Secondary-SIP-Server Addr (cont)|		Secondary-SIP-Server Addr (cont)|
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Type		Type
	?+1 (Secondary SIP Proxy server)		?+1 [To be assigned by IANA] Secondary SIP Server Address Option
	Length		Length
	6		6
	Secondary-SIP-Address		Secondary-SIP-Server-Address
	The four octet Secondary-SIP-Server Address is the address of the		The four octet Secondary-SIP-Server Address is the address of the
	secondary SIP server to be used by the local peer. If all four		secondary SIP server to be used by the local peer. Setting four
	octets are set to zero, it indicates an explicit request that the		octets are set to zero requests that the peer provide the address
	peer provide the address information in a Config-Nak packet.		information in a Config-Nak packet.
	Default		Default
	No address is provided.		By default, no secondary SIP address is provided.
	3. IANA Considerations		3. IANA Considerations
	Requires IPCP option number assignment
			Requires IPCP option number assignment
	4. Acknowledgements		4. Acknowledgements
	A major portion of the text in this memo was quoted from RFC 1877.		A major portion of the text in this memo was quoted from RFC 1877.
	References		References
	[1] Simpson, W., Editor, "The Point-to-Point Protocol (PPP)", STD 51,		[1] Simpson, W., Editor, "The Point-to-Point Protocol (PPP)", STD 51,
	RFC 1661, Daydreamer, July 1994.		RFC 1661, Daydreamer, July 1994.
	[2] Steve Cobb, "PPP Internet Protocol Control Protocol Extensions for		[2] Steve Cobb, "PPP Internet Protocol Control Protocol Extensions for
	Name Server Addresses" RFC 1877, Microsoft,		Name Server Addresses" RFC 1877, Microsoft,
End of changes. 21 change blocks.
	45 lines changed or deleted		39 lines changed or added
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