Xintong Zhou

1
SIP Configuration

• Xintong Zhou
• Department of Computer Science
• Presentation for COMS W4995 VoIP Security
• Course Advisor Prof. Schulzrinne

2
Outline

• Summary of configuration using DHCP
• Framework for SIP User Agent Profile Delivery

3
Configuration Using DHCP

• Step 1 Set up DHCP server
• Include local SIP outbound proxy information
• Response SIP Server DHCP Option requests

4
Configuration Using DHCP

• Step 2 Device broadcasts DHCPDISCOVER
• Device sends
• requests to IP
• broadcast address.
• Device requests
• SIP Server Option.

5
Configuration Using DHCP

• Step 3 Device receives DHCPOFFER
• Device may receive
• several
• DHCPOFFER.
• Device will accept
• one address offer
• and decline others.

6
Configuration Using DHCP

• Step 4 Device broadcasts DHCPREQUEST
• Device broadcasts
• DHCPREQUEST
• including identifier
• of the server whose
• offer has been
• accepted.

7
Configuration Using DHCP

• Step 5 DHCP server acknowledges the request
• The chosen DHCP
• server acknowledges
• the request.
• Other servers know
• that device has
• declined their offers.

8
Configuration Using DHCP

• Device gets its network address and SIP outbound
  server information.

9
Framework for SIP User Agent Profile Delivery

• draft-ietf-sipping-config-framework-15

10
Features

• Support profiles provided by different
  administrative domains
• Local-network profile
• Device profile
• User profile
• Provide standardized and unified process SIP User
  Agents
• Discover different profile sources
• Request profiles
• Subscribe and receive profile modifications

11
Features

• Subscribe profile update
• SIP event packages (ua-profile)
• Receive profile update
• Use SIP protocol (e.g. NOTIFY body)
• Use file retrieval protocols (e.g. HTTP, HTTPS)

12
Reference Model

• For each profile type
• PNC Enroll and notify devices
• PCC Store and provide profile contents

13
Profile Delivery Stage - 1

• Profile enrollment

14
Profile Delivery Stage - 2

• Profile content retrieval

15
Profile Delivery Stage - 3

• Profile change notification

16
SIP Event Package

• Package name ua-profile
• Package parameters
• SUBSCRIBE profile-type, vendor, model, version
• NOTIFY effective-by
• Example Event header
• SUBSCRIBE
• Event ua-profileprofile-typedevice
  vendor"vendor.example.com"model"Z100"
  version"1.2.3"
• NOTIFY
• Event ua-profileeffective-by3600

17
SUBSCRIBE Request URI

• For local-network profile
• _sipuaconfig . local_network_domain
• Preconfigured
• DHCP (Domain Name option)
• For device profile
• device_identifier _at_ device_provider_domain_name
• For user profile
• Users AoR

18
Example Step 1
19
Example Step 2
20
Reference

• Configuration
• http//wiki.cs.columbia.edu/display/hgs/Configura
  tion
• RFC 2131
• Dynamic Host Configuration Protocol
• RFC 3361
• Dynamic Host Configuration Protocol
  (DHCP-for-IPv4) Option for Session Initiation
  Protocol (SIP) Servers
• RFC 3319
• Dynamic Host Configuration Protocol (DHCPv6)
  Options for Session Initiation Protocol (SIP)
  Servers
• draft-ietf-sipping-config-framework-15
• A Framework for Session Initiation Protocol User
  Agent Profile Delivery
• RFC 3265
• Session Initiation Protocol (SIP) Specific
  Event Notification