sip-qos-osp-01 1

To Do Items for Interdomain SIP 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

…what it takes to build interdomain SIP telephony w. QoS…

In scope for SIP WG or new WG? See the evidence…

sip-qos-osp-01 2

Interdomain SIP-QoS Needs Framework

Internet Access Network – ISP1

Internet Access Network – ISP2

Internet Transit Network(s)

Edge Router

Border Router

Border Router

Edge Router

Clearing House

to IP

transit

network

Analog, PBX or ISDN phones

Policy Server

SIP Proxy

Edge Router

802.1p LAN

Access Network

IP Tel Gateway

Circuit SW Net

SIP Phone

PC

Wireless devices

Interdomain and transit model

Access network

sip-qos-osp-01 3

QoS Models for IP TelephonyQoS Models for IP Telephony

1. QoS Assured: Emulates the PSTN No QoS – no call (DCSGROUP IP or OK?)

2. QoS Enabled: Internet style QoS most of the time Give user the choice to proceed without QoS

3. Best Effort: No commercial grade service

Local Policy ModelsLocal Policy Models Push model, pros/cons Pull model, pros/cons

sip-qos-osp-01 4

Detailed Call Flows: QoS Enabled Pull Model

SIP1 POL1 CH POL2 GWYSIP2R2R1

1 INVITE2 REQ OSP

4 <AuthRsp>

3 <AuthReq>

5 DEC

6 INVITE 7 INVITE

19 18020 18021 180

28 PATH 29 PATH 30 PATH

31 RESV33 RESV 32 RESV

34 RESV-CONF 35 RESV-CONF 36 RESV-CONF

37 PATH39 PATH 38 PATH

40 RESV 41 RESV 42 RESV

43 RESV-CONF45 RESV-CONF 44 RESV-CONF

22 200 OK23 200 OK24 200 OK

25 ACK 26 ACK 27 ACK

Direction 1

Direction 2

RSVP Signaling

Telephony Signaling

SIP Phone

9 REQ LDP10 DECLDP

11 RPT12 DEC

13 183

17 DEC

15 DECLDP

16 RPT18 183

14 REQ LDP

8 183

sip-qos-osp-01 5

QoS Enabled BYE – Push Model

SIP1 POL1 CH POL2 GWYSIP2R2R1

Established Call

BYE

PATHTEAR

SIP Phone

DRQ(OSP)

BYE

BYE

PATHTEAR

PATHTEAR

PATHTEAR

PATHTEAR

PATHTEAR

DRQ path

DRQ resv

DRQ path

Te

lep

ho

ny

Sig

nal

ing

RS

VP

Sig

na

ling

200 OK200 OK200 OK

DRQ resv

sip-qos-osp-01 6

QoS Enabled Push Model: RSVP Teardown

SIP1 POL1 CH POL2 GWYSIP2R2R1

Established Call

PATHTEAR

DEC RemLDP

PATHTEAR

SIP Phone

RPT(LDPtear)

RPT (LDPtear)

DEC RemLDP

PATHTEAR

RPT

RPTDEC REM

LDP DEC REMLDP