XO Origination termination overview

VOIP information
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This is a page on XO's SIP Origination/Termination product- if you have any questions about posting guidelines please see "how to post".

XO and Level3 are really the two largest providers of SIP Origination/Termination in the United States. Sure there are a lot of companies out there who resell both carriers products and claim to have the most traffic. In most cases a lot of companies do LCR between the two that I have mentioned. We will work with you on getting the traffic you need to meet the minimums. Go with the companies that will give you the best qualities. Everyone today wants to be the next Vonage- dont make the same mistakes, go with a company that has a large enough network to support high quality (PSTN Quality) voice over IP.

Lets talk more about how I can help you with your carrier needs. We do offer other TDM based and Commercial VoIP offerings that you might be able to use to offset the cost of doing business.

Most hosted IP providers use XO's extensive network coverage to provide point to point services to client locations that allow for hosting of PBX type services as well as access to the internet.

We have a great hub and spoke DS3 set up that has VERY low monthly charges- its perfect for serving up bandwidth to your clients and is very cost effective. Call or Email me today for more details!


Voice Over Internet Protocol (VoIP) Origination provides reliable inbound access for carriers via the XO IP network. It enables qualified service providers to receive local telephone calls from remote XO markets, different from the XO market in which the provider is physically located. XO VoIP Origination can help:

  • Eliminate capital expense associated with building a physical "POP"
  • Create a national virtual presence or a local presence in a remote city or town
  • Accelerate business expansion into new markets
  • Reduce the need for Toll Free numbers for enhanced service applications
  • Applications that qualify for VoIP Origination service include:

VoIP Telephony Applications (e.g. VoIP providers needing to assign telephone numbers to end-users)

  • IP Fax Services
  • Internet Service Providers
  • VoIP Origination can be combined with XO VoIP Termination to provide a complete solution for carriers.


VoIP Origination provides:

  • Inbound (originating) service from multiple markets
  • Reliable Intercity transport network via the XO OC-192, MPLS-enabled IP backbone
  • Local Number Portability via the XO VoIP Services Portal (Enhanced Service Provider Interface - ESPI)
  • Directory Listing
  • Caller ID with Name
  • 500 DID's per market (38 Markets total coverage of US)

Inter-City service is delivered to the service location over the following access methods:
  • Session Initiation Protocol ("SIP") Private Session Border Controller Access
  • SIP Dedicated Internet Access into the XO IP network
  • Time Division Multiplex ("TDM") via PRI, CAS, or SS7 signaling

See Areas of Coverage


Voice Over Internet Protocol (VoIP) Termination provides reliable long distance connectivity for carriers via the XO IP network to terminate an IP-originated call to the Public Switched Telephone Network. It enables enhanced service providers to offer long
distance VoIP access to residential and commercial customers.

XO VoIP Termination can help:
  • Connect your switch to the robust XO Sonus softswitch infrastructure
  • Transport your end-users' interstate & intrastate long distance traffic over the high speed XO Tier 1 OC-192 IP backbone
  • Provide access to the XO IP infrastructure and PSTN for carriers that own a feature server
  • Eliminate the need to negotiate with multiple vendors or manage a variety of complex interconnection sites and contracts

Applications that qualify for VoIP Termination service include:
  • VoIP Telephony ASP Applications
  • Broadband end-user access
  • IP Fax Services

VoIP Termination can be combined with XO VoIP Origination to provide a complete solution for carriers.


VoIP Termination provides:
  • Connectivity from an IP network to the PSTN for terminating domestic long distance calls
  • Nationwide interstate and intrastate termination (outbound) service
  • Multiple interconnection options — both Session Initiation Protocol ("SIP") and Time Division Multiplex ("TDM")
  • Reliable intercity transport via the vast XO IP backbone and Sonus infrastructure
  • NPA NXX billing structure which enables aggressive pricing over LATA/OCN models
  • All calls billed in six-second increments, with an initial six-second minimum
  • Detailed usage reporting (hourly, daily, monthly)
  • 24x7 customer and technical support

XO VoIP Termination provides wholesale network capabilities via multiple interconnection options, including:
  • Private Ethernet Access into XO Session Border Controllers (FastE / GigE)
  • Dedicated Internet Access into the XO IP Network
  • Public Internet or "bring your own" access
  • TDM interconnections can be supported as well (CAS, DS-1 / DS-3, SS7, PRI)

The facts

  • Long Haul Statistics
    • 16,000 route miles
    • Eight core BLSR rings
    • 32 long-haul POPs

  • Metro Statistics
    • 72+ Metro Market
    • SONET, DWDM capable All Tied to the Long Haul
    • Complete End to End Solutions

  • PSTN
    • Class 5 switches: 34 DMS 500 and 31 Lucent 5EES
    • Redundant SS7 network
    • 1,618 rate centers covered with DEOT and tandem trunking
    • 108,000 NPA / NXXs covered via FGD network
    • 90% of the US business population covered

  • VOIP
    • SONUS release 5.1.8
    • Redundant Network Architecture
    • G.711, 20 ms, no silence suppression (beter quality) Compression available end of quarter (06)
    • ACME Session Director Release 1.2.1
    • Low bit rate coding (G.729), T.38 and RFC 2833 planned for YE05
    • G.729 is an 8 Kbps coding of voice traffic from 64Kbps
    • T.38 ITU-Y recommendation defines Internet Facsimile protocol consisting of messages and data exchanged between Facsimile **Gateways using an IP network
    • RFC 2833 RTP payload for DTMF digits, telephony tones and telephony signals, May 2000
    • 1,000 originating Rate Centers (per May 2005 LERG summary)

  • Integrated TDM and Packet-based Networks
    • Integrated TDM and Packet-based Networks
    • PSTN SS7 compliant network since 1994
    • VOIP network since 2000
    • SS7 CAS SIP protocols available
    • Voice designed as the principal application on the XO network
    • XO hybrid architecture provides customers proven TDM voice technology with the cost reduction and scalability associated with soft Switching technology
    • TDM VOIP network allows customers of XO the opportunity to migrate voice and data services in an elegant manner

IP Network
    • OC-192c IP network on the XO long-haul fiber infrastructure
    • Inter-city: nine IP core nodes (Juniper)
    • 12 OC-192c circuits
    • Provide intercity IP transport and peering connectivity
  • Metro: 62 POPs in 34 markets (Cisco)
    • Dual uplinks to IP backbone from each market (OC-3C to OC-48c)
    • Customer Internet access connections (DS-1 to OC-48)
    • Traffic aggregation (VOIP gateways, Dial and DSL)
    • Routing
    • BGP is used to learn and advertise all XO customer & Internet routing destinations
    • OSPF is used to advertise information about available network topology
    • Customer can use status, RIP or BGP as required

  • Data Center
    • Various locations across the US

  • XO Maintains Robust Peering Connections
    • XO is fully peered
    • XO can reach 100% of Internet destination through our public and direct interconnections
    • XO does not use IP transit to reach any destination
    • Overall: 50640 Mb capacity to XO peers
    • Public: 8000 Mb active
    • 8 GigE interfaces at PAIX, Equinix and NAP of America
    • Direct: 42640 Mb active
    • Interconnects via OC-3c to OC-48c, FastE and GigE
    • Majority is OC-12c

Near Future Added Benefits
  • Building new capacity to support up to (10) 10G waves between any two contiguous XO markets
  • Ultimately, the system can support up to (40) 10G waves.
  • The current estimated timeline has the first segments of the network being handed over to XO the beginning to middle of May with *Network augment completed by the end of August

Created by: lejoneric, Last modification: Tue 24 of Oct, 2006 (16:39 UTC)
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