Interconnect Billing and Settlement for VoIP

1
Interconnect Billingand Settlement for VoIP

• 20 March 2008
• Jim.Dalton_at_TransNexus.com

2
Common Carrier Interconnect

• Everyone in VoIP complains about the PSTN, but
  its interconnect model works.
• Every carrier accepts traffic from every other
  carrier.
• No call is ever blocked.
• (Similar to the Internet with net neutrality)
• Every carrier has an economic incentive to
  terminate traffic from other networks.

3
How Carrier Interconnect Works

• The US SS7 Network (PSTN)
• Thousands of anonymous peers
• Complete and efficient route discovery
• LERG
• LNP database
• An efficient economic model
• Multi-lateral financial settlement
• Independent clearinghouses

4
SS7 Voice Peering Fabric
LERG
LNP
Multi-lateral Clearinghouse
5
Carrier Access Billing (CABS) CDR

• 2020090708315900035E89E890000000000000000000000000
  00000000000000000000000001200000000000000000000000
  00000000000000000112300000000000000000000000000000
  00000000000000000000000000000000000000000000000000
  0000000000
• 11010107082810706632000000010404872393720469000000
  18201140160008330020003500000100000000300000600001
  000310215E89000000000000000000000000000000000DJ3Z0
  00833000000000000346040496100000000901730000000000
  0000000000
• 11010107082810706632000000010706454515220469000000
  18200945390002011020003500000100000000300000600001
  000310215E89000000000000000000000000000000000DJ3Z0
  00201100000000000346040496100000000901730000000000
  0000000000
• 11010107082910404200999900010404418101020537000000
  10001003310008090020003500003100000000308000600001
  000310221E89040000000000000000000000000000000DJ3Z0
  00809000000000007473040441810000000301730000000000
  0000000000
• 11010107082910404200999900010404418121220537000000
  10001501520008033020003500003100000000308000600001
  000310221E89040000000000000000000000000000000DJ3Z0
  00803300000000007473040441810000000301730000000000
  0000000000
• 11010107082910404200999900010404418121220537000000
  10001636220000566020003500003100000000308000600001
  000310221E89040000000000000000000000000000000DJ3Z0
  00056600000000007473040441810000000301730000000000
  0000000000
• 11010107082910404200999900010404961040520537000000
  10001756430000034020003500003100000000308000600001
  000310221E89040000000000000000000000000000000DJ3Z0
  00003400000000007473040441810000000301730000000000
  0000000000
• 11010107082910404200999900010404961040520537000000
  10002001090001018020003500003100000000308000600001
  000310221E89040000000000000000000000000000000DJ3Z0
  00101800000000007473040441810000000301730000000000
  0000000000

6
VoIP Peering (Interconnect) Clearing Settlement
is Bilateral
Peer 1
Peer 6
Peering Service Provider
CDRs
CDRs
CDRs
Peer 2
Peer 5
Session Border Controller
CDRs
CDRs
Peer 3
Peer 4
CDRs
CDRs
7
ENUM Federation Peering
Peering Service Provider
Peer 1
ENUM Directory
Peer 6
CDRs
CDRs
Peer 5
Peer 2
CDRs
CDRs
Peer 3
Peer 4
CDRs
CDRs
8
Multi-lateral Clearing Settlement
Multi-lateral Clearinghouse
Peer 1
Peer 6
CDRs
CDRs
Peer 5
Peer 2
CDRs
CDRs
Peer 3
Peer 4
CDRs
CDRs
9
OSP Settlement CDR
ltUsageIndication componentId"47850982870685430174
"gt ltTimestampgt2005-05-12T173333Zlt/Timestampgt ltSe
rvicegtVoicelt/Servicegt ltTransactionIdgtTransaction
IDlt/TransactionIdgt ltCallId encoding"base64"gtCall
IDlt/CallIdgt ltSourceInfo type"e164"gtCalling
Numberlt/SourceInfogt ltDeviceInfo
type"transport"gtSource IP Addresslt/DeviceInfogt
ltDestinationInfo type"e164"gtCalled
Numberlt/DestinationInfogt ltDestinationAlternate
type"transport"gtDestination IP
addresslt/DestinationAlternategt ltUsageDetailgt
ltAmountgt23lt/Amountgt ltUnitgtslt/Unitgt
ltStartTimegt2005-05-12T173310Zlt/StartTimegt
ltAlertTimegt2005-05-12T174212Zlt/EndTimegt
ltEndTimegt2005-05-12T174227Zlt/EndTimegt
ltConnectTimegt2005-05-12T174217Zlt/ConnectTimegt
ltReleaseSourcegt0lt/ReleaseSourcegt lt/UsageDetailgt
10
OSP Clearinghouse Example
OSP Server
11
Call Accounting
OSP Server
12
Multiple Clearinghouses
OSP Server
OSP Server
Internet
Purple Clearinghouse Network
Yellow Clearinghouse Network
13
Call Accounting
OSP Server
OSP Server
Internet
Purple Clearinghouse Network
Yellow Clearinghouse Network
14
OSP Details

• OSP is a message set for IP session interconnect
  and billing
• OSP messages
• XML format
• Transmitted via HTTP
• An OSP server is a web server
• ETSI TS 101 321
• OSP Enabled VoIP devices
• Cisco, Veraz, Stratus, OpenSER, SIP Express
  Router, Asterisk