Transcript To Do Items for SIP QoS

To Do Items for Interdomain SIP QoS
…what it takes to build interdomain SIP telephony w. QoS…
SIP


SDP

COPS


Policy
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
SIP 4xx failure messages for QoS (coordinate with DCS group)
SIP and OSP interworking RFI
qos-attribute= qos assured | qos enabled
Clients to support SIP and RSVP coordination
Client to support OSP functions
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…
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Interdomain SIP-QoS Needs Framework
Clearing House
Interdomain and
transit model
Internet Access
Network – ISP1
Internet Transit
Network(s)
Edge
Router
Border
Router
Wireless
devices
Access network
Internet Access
Network – ISP2
Border
Router
Edge
Router
Access Network
Policy
Server
Circuit
SW Net
transit
SIP
Proxy
SIP Phone
IP Tel
Gateway
to IP
network
Edge
Router
802.1p
LAN
Analog, PBX or
ISDN phones
PC
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QoS 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 Models

Push model, pros/cons

Pull model, pros/cons
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Detailed Call Flows: QoS Enabled Pull Model
SIP Phone
POL1
SIP1
R1
CH
POL2
R2
SIP2
GWY
1 INVITE
2 REQ OSP
5 DEC
3 <AuthReq>
4 <AuthRsp>
6 INVITE
Telephony Signaling
8 183
10 DEC
LDP
11 RPT
9 REQ LDP
12 DEC
13 183
14 REQ LDP
Direction 2
Direction 1
18 183
RSVP Signaling
7 INVITE
17 DEC
15 DEC
LDP
16 RPT
21 180
20 180
19 180
24 200 OK
23 200 OK
22 200 OK
25 ACK
26 ACK
27 ACK
28 PATH
29 PATH
30 PATH
33 RESV
32 RESV
31 RESV
34 RESV-CONF
35 RESV-CONF
36 RESV-CONF
39 PATH
38 PATH
37 PATH
40 RESV
41 RESV
42 RESV
45 RESV-CONF
44 RESV-CONF
43 RESV-CONF
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QoS Enabled BYE – Push Model
SIP Phone
POL1
SIP1
R1
CH
POL2
R2
SIP2
GWY
Telephony Signaling
Established Call
BYE
BYE
DRQ(OSP)
BYE
200 OK
200 OK
200 OK
PATHTEAR
PATHTEAR
DRQ path
PATHTEAR
RSVP Signaling
DRQ resv
DRQ path
DRQ resv
PATHTEAR
PATHTEAR
PATHTEAR
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QoS Enabled Push Model: RSVP Teardown
SIP Phone
SIP1
POL1
R1
CH
POL2
R2
SIP2
GWY
Established Call
PATHTEAR
PATHTEAR
RPT(LDP
tear)
PATHTEAR
RPT (LDP
tear)
DEC Rem
LDP
DEC Rem
LDP
RPT
DEC REM
LDP
RPT
sip-qos-osp-01
DEC REM
LDP
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