To Do Items for Interdomain SIP QoS

1
To Do Items for Interdomain SIP QoS
what it takes to build interdomain SIP telephony
w. QoS

• SIP
• SIP 4xx failure messages for QoS (coordinate
  with DCS group)
• SIP and OSP interworking RFI
• SDP
• qos-attribute qos assured qos enabled
• COPS
• Clients to support SIP and RSVP coordination
• Client to support OSP functions
• Policy
• Local networks PIB for RSVP
• Transit networks DiffServ specifics for voice
• Metering
• Traffic flow metrics for interdomain use

In scope for SIP WG or new WG? See the evidence
2
Interdomain SIP-QoS Needs Framework
Interdomain and transit model
Access network
3
QoS Models for IP Telephony

• QoS Assured Emulates the PSTN
• No QoS no call (DCSGROUP IP or OK?)
• QoS Enabled Internet style
• QoS most of the time
• Give user the choice to proceed without QoS
• Best Effort No commercial grade service

Local Policy Models

• Push model, pros/cons
• Pull model, pros/cons

4
Detailed Call Flows QoS Enabled Pull Model
5
QoS Enabled BYE Push Model
SIP Phone
SIP1
POL1
POL2
SIP2
CH
GWY
R2
R1
Established Call
BYE
BYE
Telephony Signaling
DRQ(OSP)
BYE
200 OK
200 OK
200 OK
PATHTEAR
PATHTEAR
DRQ path
PATHTEAR
DRQ resv
DRQ path
DRQ resv
RSVP Signaling
PATHTEAR
PATHTEAR
PATHTEAR
6
QoS Enabled Push Model RSVP Teardown