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© 1999, Cisco Systems, Inc.
VoIP In the News
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© 1999, Cisco Systems, Inc.
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406 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
VoIP In the News
406 1028_05F9_c4
© 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr
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Deploying Large Scale Voice Over IP Session 406
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© 1999, Cisco Systems, Inc.
Topics
• Brief Introduction to H.323 and Applications • Sample Network Scenario • Design Topics • Billing Topics •Q&A 406 1028_05F9_c4
© 1999, Cisco Systems, Inc.
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H.323 Standard • ITU recommendation V1 approved in 1996, v2 in January 1998
• Defines multimedia applications over packet-based networks • Leverages existing standards • Wide market acceptance • Facilitates interoperability between vendors • Cisco VoIP solutions are H.323 compliant 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
Example: H.323 Zones H.323 Gatekeeper A GK
H.323 Client
QoS WAN
H.323 Gatekeeper B GK
Gatekeeper Zone A
Gatekeeper Zone B
H.323 GW
Local PSTN
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V Local PSTN
© 1999, Cisco Systems, Inc.
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Local PSTN
V
V Local PSTN
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Gatekeeper Mandatory Services • Address Translation Translates H.323 aliases or E.164 addresses into IP transport addresses (e.g. 10.1.1.1 port 1720)
• Admissions Control Authorizes access to the H.323 network
• Bandwidth Control Manages endpoint bandwidth requirements
• Zone Management Provides the above functions to all terminals, gateways, and MCUs that register to it 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
RAS Messages • GRQ/GCF/GRJ (Discovery) Unicast—Multicast, find a gatekeeper
• RRQ/RCF/RRJ (Registration) Endpoint alias/IP address binding, endpoint authentication
• ARQ/ACF/ARJ (Admission) Destination Address Resolution, Call Routing
• LRQ/LCF/LRJ (Location) Inter-gatekeeper communication
• DRQ/DCF/DRJ (Disconnect) Get rid of call state 406 1028_05F9_c4
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H.323 Message Exchange Gatekeeper A
Gatekeeper B
LRQ LCF
ACF
ACF
IP Network ARQ
V
Gateway A
ARQ
H.225 (Q.931) Setup H.225 (Q.931) Connect H.245
V
RTP
Gateway B
Phone A 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
Applications—Single-Stage Dial Enterprise Application: Inter-PBX Trunk Replacement (Without Features)
Service Provider Application: Wholesale Minute Providers 406 1028_05F9_c4
PBX
PBX
TDM
PBX
PBX
IP V
V
LEC & IXC
LEC & IXC
© 1999, Cisco Systems, Inc.
Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. Presentation_ID.scr
LEC & IXC
TDM
IP V
V
LEC & IXC
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Applications—Two-Stage Dial Class 5
Class 5
IP V
V
IXC
• Service Provider Application: The customer has selected traditional IXC, but dials a number to get access to the bypass provider’s network. After authenticating can make the call to the ultimate destination 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
Enterprise Managed Service Analog or Digital Interfaces V
PBX V
PSTN
IP V
PBX
Demarcation
• Service Provider Application: The Enterprise customer can choose to purchase long distance service, and/or an intracompany VPN service 406 1028_05F9_c4
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Topics
• Brief Introduction to H.323 and Applications • Sample Network Scenario • Design Topics • Billing Topics •Q&A 406 1028_05F9_c4
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© 1999, Cisco Systems, Inc.
Anatomy of a Network GK
HSRP
GK
H.323 Zone
POP V
IVR DSPs Cisco IOS®
GK
H.323 Zone
POP
POP
POP
V
T1/E1 Signaling
V V
IVR DSPs Cisco IOS®
T1/E1 Signaling Local PSTN
Customer 406 1028_05F9_c4
HSRP
GK
© 1999, Cisco Systems, Inc.
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Local PSTN Customer 14
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Sample Network Dimensioning • 20 POPs across the U.S. • Have access servers today providing dial-up services. Familiar with and prefer to use RADIUS for billing • 96 voice ports per POP, have 720x routers for backhaul • Provide two-stage calling card and wholesale to smaller carriers • Voice and fax calls • Wants to deploy in NY, Chicago, LA, and Miami now • Deploy in the rest of the POPs within a year • Design for growth over the next year 406 1028_05F9_c4
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Sample H.323 Design • Anticipating future growth we have carved the nation into four zones • Each zone has HSRP enabled redundant 3640 Gate Keepers (GK). Since a GK can handle approximately 1000 active calls, this represents 20 AS5300s (or 10 POPs) with today’s DSP densities • For cities that are not serviced by this network, hop-off the traffic in Chicago to a wholesale long distance carrier. • The GKs will use Direct signaling mode • On the GWs Loopback interfaces are used for H.323 gateway definitions to protect from a single interface failure
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Initial Network (Four POPs) Local PSTN
Carrier
Chicago POP
Hop-off V
V
V
Hop-Off Zone
GK
GK
Western Zone
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GK
HSRP
V
IP QoS Backbone
V
GK
V
LA POP
North-East Zone
GK
GK
V
Local PSTN
NY POP
GK HSRP
GK
GK
V
Local PSTN
Mid-West Zone
V
Miami POP
Southern Zone
Local PSTN 17
© 1999, Cisco Systems, Inc.
Sample Network (Cont.)— POP Sizing Local POP Local PSTN
PSTN T1/E1
WAN V V
Gateway
POP Sizing • Number of Gateways: 48 ports per AS5300* --> Two AS5300s
• WAN Bandwidth: Bandwidth per call: 66 bytes * 8 bits/byte * 50 pps = 26.4 kbps Total WAN bandwidth = 26 kbps * (96/2) calls [VAD provides 50% efficiency] = 1.27 Mbps * Up to 60 ports for an E1 scenario 406 1028_05F9_c4
T1/E1
QoS WAN
Assumptions: • Voice or Fax calls • Statistically there is silence on half the calls at any given time (use Voice Activity Detection) • 60 byte packets + link layer (no header compression) • G.729 CODEC used • With Higher Density DSPs, a single chassis will meet the needs
© 1999, Cisco Systems, Inc.
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Simplified Network Diagram Western GK HSRP GK
GK
V
Local PSTN
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LA Gateway West Zone
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Gateway Configuration—LA hostname la1-gw gateway ! interface Loopback0 ip address 10.10.250.1 255.255.255.0 h323-gateway voip interface h323-gateway voip id gk-west ipaddr 10.10.254.10 1719 h323-gateway voip h323-id la1-gw h323-gateway voip tech-prefix 1# ! interface Ethernet0 ip address 10.10.254.5 255.255.255.0 la1-gw.west #show gateway Gateway la1-gw is registered to Gatekeeper gk-west 406 1028_05F9_c4
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Gatekeeper Configuration—West hostname gk1-west ! interface Ethernet0/0 ip address 10.10.254.4 255.255.255.0 standby 1 priority 110